Fletch is a cheeky chappy and devoted family man who originally trained as a mechanic, before deciding on a career in nursing when he lost his business.
Most of the regulars instantly accept Fletch, but his mentor Lloyd (Michael Obiora) isn't so impressed with his confidence and happy-go-lucky ways…
Digital Spy recently gave Alex a call to hear more about his new role.
What most attracted you to Casualty?
"Well, one of the main things is that the character I've got is lovely, and again different to what I've been playing in the last few years. I think there's a lot more scope with this character - he's very free with his emotions and with the role that he's got as a nurse.
"There's a lot of room for him to do lots of nice things - whether it's getting to know people, having friendly banter, doing some flirting and being the cheeky chappy. But we can also see him dealing with the serious side of life - big events where you're faced with life and death situations. I think there's so much to do in this show - and this character has the opportunity to do all of it! That's great for me."
Did you have to audition for Fletch, or did the Casualty team have you in mind for the role?
"When they thought up the part, they thought of me and a couple of other people who would be good choices to do it. Then we had a chat, we had a screen test, and they decided to go with me!"
Have you had much input into Fletch's development, or have you been given quite a definite brief?
"I've been given a really good, solid brief about the kind of chap that Fletch is, but then since I've started filming, we've had another chat and we've spoken further about him. We've discussed some of the things that I've been doing, what I've brought to it and whether it's changed.
"So it's quite a nice partnership - they've given me a really great character, but now we're looking at other things. They've looked at the performance, seen which sides they like and what we should see more of."
Do you think Fletch is going to be quite a relatable character?
"I think so - hopefully! He's a good bloke, he's fun, he likes to have a flirt, and I think people can see that he's got a bit of charm about him. The patients who come into the ED can certainly see that, and they seem to enjoy chatting to him. I think people will relate to him - he seems like quite a nice bloke to be a nurse."
Could he be hiding any secrets?
"So far, he's a very straight-down-the line character - he's got three kids, he's very happy, he loves his job, he's enjoying learning new skills and he enjoys getting involved with the patients. He doesn't have any dark secrets yet - or at least I haven't found out any yet! But who's to say that he won't?"
What can you tell us about the dynamic between Lloyd and Fletch?
"I think Lloyd was expecting a mentee who would be younger and slightly more impressionable. He wanted to do some proper mentoring and show the correct way of doing everything. But then all of a sudden, somebody ten years older turns up and already has a lot of confidence.
"The rest of Lloyd's colleagues and friends all seem to like Fletch, but the jury's out with Lloyd - he's not quite sure. Fletch can also see that Lloyd is a very serious character, so he enjoys winding him up a little bit. It's not to be malicious, he just wants to be fun and get past the seriousness of Lloyd. I think they will eventually get along, but at first Lloyd's not so sure."
Will we get to meet Fletch's family?
"They're off screen at the moment, but there is talk of the family coming in. So fingers crossed, it might be quite nice to see them! I'm not sure in what kind of context yet, but I think they are going to make an appearance at some point."
As Fletch is flirting quite a bit, is there a chance he could be unfaithful?
"Oh, with his flirting, there's no ulterior motive other than it is quite fun to flirt! He's quite happy to go home to his wife, but if you're surrounded by attractive ladies and there's a twinkle, then twinkle away! That's his kind of attitude, anyway."
Fletch already has a history with the hospital as his daughter was born there, wasn't she?
"Yeah, that's the reason he went into nursing. He was a mechanic beforehand, but he saw what was on offer as a nurse when his daughter was born. He was half-way there already with his people skills, so he just thought, 'I used to fix cars, so why can't I fix people?'
"So it's a cool place to be for Fletch - it reminds him of his family and he has happy memories there. He's quite a nice, rounded bloke who's very happy to be around and wants to enjoy his work."
Who else does Fletch share lots of screen time with?
"I think Fletch and Tess seem to be getting on really well - she quite likes the fact that he's a bit of a joker and that there's a bit of laughter going on in the ED.
"Fletch has also been working with Zoe, but he oversteps the mark with her because he doesn't really acknowledge the hierarchy when they're having a chat. When they're in resus, he understands that she's in charge and that Nick Jordan's in charge. But once they're out of that high-pressure environment and they're all chatting, he's liable to say anything to anyone! He's not worried whether you're the boss or not."
How welcoming were the Casualty cast when you joined?
"Do you know what, I couldn't have asked for them to be any nicer, really. I knew a few of the cast from previous jobs, but everyone was just so lovely straight away. They really tried to put me at ease, so it was honestly a really nice and relaxing transition into this place. It couldn't have been better."
We've recently seen you on Waterloo Road, so were you sad to say goodbye to the show?
"Yeah, Waterloo Road was great fun and they're a cracking cast and crew. I had a real ball doing that, so it's a shame to say goodbye to all my pals, but onwards and upwards - that's the nature of the game!"
After being in so many big shows, do you still get nervous taking on a new job?
"Oh, yeah - definitely 100%! There's a lot of pressure when you're going into big shows that are really well-supported and well-loved. People are honest and if they think you're rubbish, they'll let you know!"
Are you enjoying working in Wales?
"Yeah, I've thoroughly enjoyed it. Most of the time I am at work and I haven't been able to explore as much as I would have liked to, but from what I've seen, it's lovely. There's beautiful countryside, and the people have been very friendly and welcoming. It's great and I'm having a very nice time here, actually."
Will you watch your first episode when it goes out?
"I'll probably watch it a bit later - just because I get a bit nervous, really! It's a bit too much pressure when I know that everybody else is watching - there's a lot of people that watch Casualty. So I'll probably stick it on the iPlayer and have a little watch!"
> Read more 'Casualty' spoilers and news
Casualty airs tomorrow (June 30) at 9.10pm on BBC One.