I am not sure which forum to post this, mods please move if necessary.
My 16 year old grand daughter is going on a school trip to the London area in 2 weeks time. Accommodation in a college dorm., all meals and all educational excursions are included, so she only need some spending money. I have promised to provide this, but I am so out of touch with UK. (especially South of England prices) that I am unsure of how much to give her. I do not want to get into a bidding war (no my Grandpa is richer than yours scenario).
Advice please, from those members more in touch than I am. How much per day.