I think the time has finally come when I may get to convert the "storage
room" at the end of the garage into a "workshop" as was intended when
the building was erected about 10 years ago. With that in mind I need to
wire up the electrics (there's already a CU there, currently supplying
lighting and a single socket for the garage).

Given the 'workshop' element, I want to fit one ring of surface-mounted
metal-clad sockets (probably these: http://preview.tinyurl.com/2vda3wg)
and was going to use surface-mounted PVC conduit (it's a
single-thickness block-building). Thing is, although I've done plenty of
wiring before I've never used conduit and am not entirely sure how to go
about it: I could really use an on-line how-to-do-it guide but can't
find one - is there such a resource around?

To be honest I have no intention of taking this to Building Control but
still want the work to be up to standard. Is PVC conduit considered
acceptable in this sort of environment? (We're talking a very low-key,
domestic, end-of-garage-type workshop, not one with lots of massive
machine tools etc).

Do you have to use single-core wires; ie, will two 2.5mm2 T&E cables not
fit down a standard 20mm PVC conduit? And/or does that present potential
overheating problems? I'd rather not have to use single-core stuff if I
can help it, as I've got plenty of T&E, and you can only buy the singles
in 100m lengths AFAICS.

How do the couplers, male and female adaptors etc work in connecting up
conduit boxes and socket boxes etc? Probably be obvious when I've got
them in my hands, but I'm putting together an on-line shopping list...

As I say - a simple Noddy guide is probably what I need!

Thanks
David