Thank you everybody for your opinions, covering pretty much every option. You have helped my crystallise my thoughts.
Yes, it is spelt McLaren, and I have 601 / 2 x 901, not 02 series! The 02 series were designed by Bruce Crothers, and came out about 4-5 years after mine.
We are downsizing partly because we no longer have horses, and the old property with stables and so on is a lot of work and expense to keep running. The plan is to buy (or maybe build? ) a retirement property elsewhere, using some of the capital released by the first move. Then when we retire and move, proceeds of temporary property become a nest egg.
I think my short term plan is to do nothing, other than weed out recordings that I will never listen to again (why did I buy a Sting album?), and ditch cassette player and tuner, which were rarely used even when system was set up. Storage is surprisingly expensive - about £200 a month for a room sized space, so in a few years you have paid for the equivalent of a pretty exotic system, but I can wait until we have a specific plan for the retirement property, and know something about size and existence of a man cave - it might be a glorified shed in the garden!
I will keep my amps, as examples, and also likely to be hard to sell. Turntable / arm / vinyl can go into short term storage, and reconsider once retirement property is known.