Witnesses needed for secret wedding - 15/12 London

Me & my partner have booked a secret wedding at Marylebone Town Hall on 15th December at 3pm.


We need 2 witnesses to help make our ceremony legal.
We live in Sheffield but would be very happy to return the favour, we’re often in London for work anyway so are happy to travel.
We had thought to pick strangers off the street but would prefer to have everything sorted in advance as want to enjoy our few days as much as possible.
Happy to discuss further.