The suppliers listed below are those that I have used unless noted otherwise. If I have a bad experience with one of them, I will note it here, if there is no comment to that effect, I have had no problems with them

General components

https://cpc.farnell.com/

https://uk.rs-online.com/web/

https://www.mouser.co.uk/

https://www.rapidonline.com/

https://www.switchelectronics.co.uk/

Specialist suppliers

https://www.hificollective.co.uk/
Selected high quality audio components.

https://diyaudiostore.com/
Suppliers of PCBs, kits, components and other items mostly relating to the DIY circuits of Nelson Pass.

https://www.modushop.biz/site/
European supplier of high quality chassis.

https://www.kjfaudio.com/
UK supplier of MarkAudio loudpeaker drivers

https://www.audiophonics.fr/en/
France based supplier of DIY audio components, kits and modules (not used)