Hi,
"GITS2: Innocence" has been given a very, very limited cinema outing in the UK. Mainly smaller art-house cinemas, in main cities. In Birmingham, it aired for one week only, once a day at the former UGC Cinema on Broad Street, (I say former, because it's since changed names.)
Try looking for screening details in the latest issue of Time Out magazine, available each Wednesday from any half-decent newsagent. Full screening details should be in there.
Alas, anime films rarely get major cinema releases in the UK. Even "Akira" didn't, nor "GITS1".
Pooch