how many pounds would i need if everything else is paid for?

i’m going to england next week with my family and my boyfriend to visit my uncle and auntie. we are staying at their house. my uncle and auntie have trips planned for us and because we’re their guests i’m assuming they’re paying for things like dinner and museum visits. my dad also has saved up money to convert to pounds.

we are canadian and i found out the conversion of CAD to pounds is really bad. i had $700 CAD saved and found out it’s only £300. i spent some money to get clothes for vacation and now i’m down to £180 pounds.

what is the recommended amount i should bring, if everything else is paid for? i’d like to get some souveniers for my boyfriend, and maybe a snack here and there if we want to try some british food. would £180 pounds be enough?