dropping butts is littering and smoking in public is now illegal. Not so long ago i saw two wardens stop and give a guy a ticket for dropping a butt. He got a £50 fine... so yes
No.. It's not an arrestable offence, but local council litter wardens cane fine you for littering if you drop a match or cigarette butt. Smoking IS allowed in public, but only outside, not in shops, theatres, offices etc.