Suppliers

In no particular order a list of places that sell stuff that is relevant to our interests:

London retail or trade counter

• RS has most things, more professional. 4 trade counters, including Bow.
• Cricklewood Electronics A real shop, with little drawers of stuff & everything.
• Maplin chain, more hobbyist. Getting really poor at actual components.
• Cool Components Sparkfun stuff. Personal callers now allowed by appointment.

London-based, primarily mail order

(not known whether personal calling is allowed)

• Earthshine Arduinos and other parts
• skpeng

Mail order

• Farnell has everything, more professional. Owns CPC and Newark.
• Rapid mix of stuff. Colchester.
• tinker.it
• Amazon (next-day with Russ's Amazon Prime account) - equipment is often cheaper
• Bits Box
• Barend Hendriksen Holland. Interesting RF parts.
• Keytronics Site currently down - I hope they'll come back.

Classified ads and junk sales

• engineering machinery , materials and small ads
• amateur radio rallies have lots of interesting junk and random components