Firetlynwelcome to the hobby, hope you find it as exciting and rewarding as most of us. It's might be abit much at first but it's worth sticking with it to figure eveeything out :-). And we are here to help if you ever need it.
Either of our aio fpv cameras should be fine, but the furiusfpv one is ever so slightly lighter. And on a quad like yours saving weight gets important, even if it is only a few grams.
I can't recall what weight the emax one is, but if you want let me know and I will weigh it and let you know?
As for UK suppliers I like to think we are the only one you will need.. but it might be a slightly bias answer .