To top what InterL says (and I'm a trademark expert myself as well), I did a quick trademark search in the UK, and DID find a proper mark granted in April 2013 to Malcolm Woolliams, Stephen White, Geoff White, Gideon Simons, 94 Huddleston Road, London, N7 0EG, on the proper trademark class (Class 41, which is "Entertainment", but also in classes 9 and 25, which are for CDs, DVDs, and downloadable digital music, and for Clothing including t-shirts, hoodies, sweatbands, caps and hats, as well).
They seem to be very well covered. Even if they have been using it only since 2013, and you pre-date them...it makes no difference. They protected it first, and they seem to be actively enforcing it.
My recommendation: change your band name immediately. Or wait until you get a cease-and-desist letter, but in the end you WILL have to change the name anyhow. You are, I'm afraid, infringing on their mark, and you have very few if no chances to contest that anymore (unless you did file an opposition, which it seems you didn't).