Adult Tricycle

I am looking for an adult non-folding trike 24" wheels for my mother who is now in her 70's for use at a caravan park, ideally around £250 mark. if you can recommend one or perhaps have an old one in good nick please let me know 

The virtual clubroom of the Addiscombe Cycling Club
https://addiscombe.org/members/phpBB2/
https://addiscombe.org/members/phpBB2/viewtopic.php?f=10&t=15326