It depends on the type of flying you wish to do and also if you want to restrict yourself to nice weather flying.ie Cavok. But even if you have the rating with no intention of using it, it may come to your rescue if you get caught out by the ever changing British weather. If you have ever been in Scotland you will know what i mean . It is not uncommon to experience more than 1 seasons weather in one day regardless of what season you are actually in.
Happy flying