Thanks anya for the recommendation, so much choice out there so it was invaluable.
Well, my Day's walker arrived early this morning, was only halfway through my first mug of tea
. Nicely packed, simple to assemble, only needed fitting the handles to suit my height, tighten the screws, snip off the protective polythene on the wheels and then...ready to go!
The red isn't as red as I'd like, more of a burgundy colour, but once I've customised it with flash stripes that beat-up cars have to make them go faster
and some other stuff (sparkly and pink, perhaps?) it'll suit really well. Oh, do you think I should fit a bell or a horn, perhaps?,just as a warning that this Old Lady is on the rampage, like 
Again, thanks everyone for the welcome and good thoughts 