Where are you in the UK? We might be able to give you some better advice about courses and instructors if we knew that.
I wholeheartedly agree with the idea that getting certified in the Maldives probably won't be sufficient preparation for diving in the UK. Cold water, heavy exposure protection and limited viz make for a rather different diving world. You can either transition through formal classes, or hook up with someone to mentor you, but it would be a very good idea to do your first cold water dives with someone with a lot more experience, one way or the other.
I wholeheartedly agree with the idea that getting certified in the Maldives probably won't be sufficient preparation for diving in the UK. Cold water, heavy exposure protection and limited viz make for a rather different diving world. You can either transition through formal classes, or hook up with someone to mentor you, but it would be a very good idea to do your first cold water dives with someone with a lot more experience, one way or the other.