I have always contributed towards the end of year gifts for my children's class teachers in primary school. Also got the children to write a personal thank you letter at the end of the school year.
However, once DS1 started secondary, there hasn't been a collection for a gift, so he has just made his form tutor a card (on the computer) at the end of the year with pictures of his favourite things and some funny quotes.
Now that DS2 is finishing his first year at secondary, another parent has asked if it's customary to give the form tutor a bottle of wine at the end of the year. I hadn't realised anyone did this at secondary?