So I am now in Boston. Many years ago when my sister was studying here, she had a close friend. This close friend and her husband will be moving to London at the end of the month. I met her once a few weeks ago and I will be visiting them this weekend as a farewell visit. So what gift do I get? Nothing big since they will be travelling. I don't have photos of my sister or anything like that to frame as a gift. I can give her a cd of my photo collection but it's not like they needed it. I prefer to give something that they will find useful. so what do you suggest?