MAULI, by my experience, since you have a FAA PPL, get also CPL.
If you get it, Gatwick is more free to apply bigger limits till the renewal if they guess.
In your case, since you are a little bit out of limits, I'm quiete sure you will get 1 class. But before, you have to get FAA CPL because they will want to see yuour flight licence. They don't ask your FAA medical certificate, but only the licence.