rollator walking aid (poverest BR5)

​Hi everyone!
​I work at a local care home here in the Orpington area, and I'm looking for a four-wheeled rollator walking aid (the kind with a built-in seat) for one of our wonderful residents.
​She is such an amazing lady who does so much for others, including local charity work, and having one of these would make a world of difference to her mobility.
​If anyone happens to have one in good condition that they no longer need, I would be so grateful! I’m based in Orpington and happy to drive out to pick it up around Sidcup, Bromley, or nearby areas.
​Thanks so much in advance!