Thanks for your help
@bcowen,
@DACattack and other forum members who have offered great advice on cleaning vinyl.
I think that having just spent out on a Folkvangr, an ultrasonic vinyl cleaner is hard to justify... for now.
I have just ordered a Project record cleaner- the VC S2-ALU, priced at £359 here in UK:
https://www.project-audio.com/en/product/vc-s2-alu/
When it arrives, I will try cleaning my recently purchased copy of Deja Vu and see if that helps the 'crackling' before I go back to the record shop.
I will also buy a cheap extra head shell and cartridge for my Technics turntable, so that I can easily put a cheaper one in with an elliptical stylus when playing older, worn vinyl.
I currently use an Ortofon 2M Black, which has a 'Shibata' diamond stylus.
The tone arm on my 1200G has a detachable head shell.