Did you try the digital site click here
I assume that you have checked that a 22" TV will be big enough?
I bought a 22" digital to replace a 21" analogue and returned it as, with the wide screen format, the screen was to small to watch comfortably.
I also got a DVR recorder, it was 'free' with the TV, but, as you say, they are expensive.
I realise 'elderly' is a subjective term, some would say I am elderly. If your relative is over 75 she can get a free STB click here