jhwilliams Wrote: 
> I couldn't find a reliable component that would switch mains (240v here)
> from 5v. The nearest I got was a solid state device that could switch
> 230v/3A.

Did you take a look at Omron's G3NA series?  See
http://dkc3.digikey.com/PDF/T053/1395-1397.pdf

Every model has a variant that can use 5V as a trigger, switched
voltages are 264 VAC or more, currents are 5A all the way up to 90A.

Note: for higher currents you need a heatsink.

Digi-Key has a UK webfront, so it should be readily available, at least
in the UK.


-- 
Mark Lanctot
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