Gina's right that there is no MOT emissions check on bikes in the UK at present. The EU have been pushing for leaner emissions on bikes for some time now but we've escaped it being MOT enforced for now.
I suppose it's up to you and your 'green conscience' whether to remove it or not and there's a lot of debate whether it makes much difference in the big scale of things anyway. One thing's for certain though, you'll not be able to make any carb adjustments, combined with free flow air filter/ exhausts without serious popping and pipe blueing with it left in place.
PS And welcome mate!
