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In article , "Dave"
says...
I've finally finished installing the new heating and DHW system (with
some help) but now I need to insulate all the pipework. Most of the
downstairs ceilings are down so I can get to the pipes easily; the
boiler, cylinder, zone valves and DHW circulation pump are all in the
back of the garage.
What's the best and most economical way to insulate the pipes?
I've seen the lengths of semi-rigid foam sleeve in the sheds but these
ar not going to be any good on the bends (and are not cheap).

Put the foam on a straight bit of pipe near the curve, glue it
together, then slide it over the bend when the glue has dried.
If it's an elbow rather than a bend you can mitre the sleeve.