Better res. on Multimap than Getamap (I checked). Was about to mention this a couple of days ago, but thought I’d look stupid as they’d probably been on there a while!
The issue on multimap is the (inconsistently) skewed axes, which makes it rather difficult to rip a big map off the net. Not yet investigated properly though, so it may work – I have a suspicion it’s skewed due to the difference in the map projection used by OS and GPS coords – and given the better resolution than Getamap (which it is possible to rip large 1:25k maps from 😉 ) it might be worth the bother.