MrTechGuy in Sawtry, Cambs is one of the UK’s Meridian specialists but he does other stuff as well. He just repaired a 500 series CDT for me.
Audio Gold in London N8 also offers a repair service.
The following might no longer be offering services but worth asking:
I don’t know if he’s given up repair work in favour of sales but Mark Dolbear in High Wycombe repaired a CEC amp for me to a very high standard several years ago.
Mike Solomons of London Sound (somewhere near Harrow) repaired some old Rogers speakers for me, but I’ve not used him in the last ten years and I don’t know if he’s still going. He’d clocked up 45 years when I last spoke to him in 2012…
Separates Systems:
(1) Antipodes CX and EX, Matrix Audio X-Saber DSD, Meridian DSP7000 active speakers;
(2) Lumin D2, Cary CD-308 cdp, Quad 99 power amp, Horns 5degreeN*27 speakers;
(3) Homebrew PC with Onkyo Wavio SE200 soundcard running Daphile, Quad 44 and 405.2 into Dali Zensor 1s;
(4) Sooloos C15 plus storage, Braun A2, P1, CD3, C1 and T1 into Sonus Faber Concertos.
Integrated Home System:
Sony PS-X600, Naimnet NNT01 DAB Tuner; NS02 Server; NNP01/NNP02 room amplifiers; Netstreams switches, keypads, KEF Ci130QS/Soundlight speakers.