I've got to move some of the central heating pipes
tonight/tomorrow and have a combi boiler which says
I should consult a plumber to drain/refill blah blah.
My head says that it can't be that hard...

Drain
======
Turn off boiler
Isolate heating circuit from boiler using the valves
just below the boiler.

Close the valves I stuck in last year that conveniently
isolate the section of pipe I need to work on, minus
one radiator which I'll close the valves on.

Do the work
===========
Stick a hosepipe on the drain valve, and get any water
out of the pipes that feels like coming

Do my work, expecting to get a little wet because the pipes
will still have some water in.

Refilling
=========
Open up all valves.
Turn thermostat *right* down so that boiler does nothing when
I turn it on.
Turn on boiler (but with heating functions off) because it
has a digital pressure readout, so I need it on. Refill
system. Use built in filler loop (Glowworm 30ci plus) to
get up to pressure. Go round and bleed rads and fill up
as necessary.
http://www.glow-worm.co.uk/epower/gw.../30ci-plus.pdf
says there's an auto-air vent on the boiler, so that should
take care of itself.
Turn the thermostat back up.

Questions
=========

Anything wrong with this?

If I don't finish the pipe work then I realise I'll
have to either cap the pipes or sort out my TRVs if
I don't want a flood overnight. Meanwhile, can I run
the boiler with just domestic hot water on, or will it
rely on the heating circuit to dump excess heat in
some circumstances?

Is there any reason I couldn't run the heating with just
the two radiators that are boiler side of where I'll cut
the pipe? My intuition says yes and that this is a silly
question, but I just thought I'd check.