Hello Martina,
I was in Bishop park yesterday at the children playground and there was a note regarding a scooter that was mistakenly taken. There was a phone number on the note. I don't know if it was the one you took, but the only solution might be to return there to collect the info on the note.
Best

Hello Ladies

I accidental took different scooter today afternoon around 5.30 pm from Bishops park in Putney.
I can not find any website or facebook group with mums from that area so if you onow some, please do let me know.

Thank you for your help.