I think it’s more the £50 notes. Much like using a USD100 note in the States, it’s a bit big for most daily purchases.
I ended up dumping most of mine on a couple expensive souvenirs in shops expensive enough that they’d deal with it or breaking them in banks.
Once an egg sac hatched at our communal postbox and it was magical, all these tiny yellow spot sprite things bumbling around and setting off. Put a good narrator on and people would have watched for hours.