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I know I thought 22 rads was a little excessive!
Loft is being done as and when I can (mixture of PIR on loft room walls, earthwool at ceiling/joist level and thermafleece for awkward sloping ceilings) windows go in ~6 weeks from now. We have just got confirmation on floor insulation so should be about 6 weeks away for that.
No grant applied to the quote, this is Scotland and we may be eligible for a rural Scotland grant (slightly by more the 7.5K as we're a way out of Glasgow)
I am wondering about getting a supplier who is not part of the green deal whatever to come and quote as I can't help but think the quotes are so high as suppliers know a grant will be included. Maybe that me just being synical.
22 rads feels like a hell of a lot of rads for a 4 bed house, must be why you need 2 heat pumps!
I'd start with your loft insulation and windows for now, lots of big improvements to be made before an ASHP.