If perchance you are tempted to have a go yourself theres one crucial thing you should know about the wiring. When you take the wires out snip them close to the connector block but leave a couple of inches of each wire. That way you don't forget where the wires came from when you put the new ones in ONE AT A TIME.
I charge about the same as jonjb but reckon that many will charge more.
Not that it matters now but its still not clear to me whether you have one 3 way valve or 2 zone valves.
If your pump is very old or noisy it might be worth getting that changed while the system is drained down. Same applies if you have zone valves as already mentioned.
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