child 3-wheel scooter age 5-10 in working condition, Oxford (Wytham OX2)

A bit of a long shot I realise. Our grandchildren will visit soon from overseas and one of the second-hand scooters we have for them to use here stopped working on their last visit. I've replied to lots of sale ads with no success and now family issues are reducing the time I have for the search, so I thought I'd try on here. If anyone inside or not too far outside the Oxford ring road has a 3-wheel scooter for age 5-10, in good working condition, which they're willing to pass on, I'd love to hear from you. Thank you