Walking frame (GU3 - Wood Street Village)

I'm looking for a walking frame for my neighbour. After a bad fall she is slowly getting her mobility back. She has one of those NHS zimmer frames, but it just has two tiny wheels and two legs, which is fine for indoors but hopeless for going out, because of the unevenness of her driveway and the lanes nearby where she would like to start walking. She needs something with either three or four larger wheels, some kind of brake, and ideally somewhere to hang a bag or anything else she needs to carry.