In England I have seen Polysics, Mono, Boris, Vola & the Oriental Machine, Doping Panda, Bo-Peep, Levelload, Yellow Magic Orchestra, Cornelius and Soil & "PIMP" Sessions. I couldn't make it to Melt-Banana because I had been to two other gigs in the same week and spent way too much!
I know what you mean iacus, a lot of these bands play in small clubs/ pubs. I saw Polysics in a tiny pub in Manchester and they played to less than 100 people on a tiny stage. However the legal drinking age here is 18, so of course they are 18+ gigs.
Has anyone seen Acid Mothers Temple live? They have been to the UK twice this year and I was not really interested, but I was told they are very good live and they are coming back in November.