On 21/04/2018 09:49, TimW wrote:

There are models of stairlift which will fix the rail on walls, or
onto the stairs. If there are no bends in the stair, installation is
very easy.

Ta. This merits further research.

My mother had one fitted she's got 2 steps up from the hall followed by
180 degree return up the main stairs then another 180 degree return via
1 step to the landing. The unit is "free standing" and is screwed
directly into stairs (through stair carpet) and floor so no wall or
banister attachments.
The local company came along, measured up then had about 4 weeks wait
for the track/rails to be custom made. Cost around about £4k and works
brilliantly.

Next step was to then change upstairs bathroom into a full wet-room so
no shower trays etc. Also prolonging Mums ability to stay at home, and
every week at home is £1k out of the pockets of the local care home.