some counterpoints: i don't hear much, if any, difference between locally-stored rips and the same files streamed via Tidal -- such that i stopped ripping my CDs. as for your speaker cables, i also use the Vertere stuff with a 250.2 and it's fine.
i agree that your budget should go toward improving your source. you can do a lot with £7,000! for starters, i recommend getting a dedicated streamer/DAC setup to deliver Tidal, rather than running it via optical from your TV. there are many, many options to choose from and you don't have to spend a fortune on the streamer side of the equation to get good quality.
so, let's say you get that secondhand 282 and a Hicap. you could then partner a Chord Hugo DAC with an Allo Digione (circa £150), Sonore microRendu, SOTM SMS-200, or any of dozens of other good choices -- using a PC, Mac, or NUC to do the processing/file storage if need be.
or you could just get a NDX/282 or 272/XPS and job done.