In reply to Ciderslider:
> it just feels like my body could do with a rest
Mark, the answers to your questions are often already in the text. (Not being smart-arsed.) Follow your feelings.
> although I feel that if I stop for more than a few days I'll go even further backwards)
Are you going even further backwards? It doesn't sound like it. But, even if you were, injury will put you far further backwards. Conversely, often after a rest, people are stronger.
Obviously the hardest thing about resting is the mentally 'letting go' of climbing. And mentally 'letting go' of climbing is (seemingly paradoxically) part of the discipline of climbing. You have to 'let go' to come back. Would totally echo what Ice Solo said above.
In the meantime, here's a little exercise which may help. Elbows tight by sides, hands bunched in fists, thumbs touching, arms extended. Now bring your arms up slowly in a reverse curl, until your fists are by your chest. When you learn the movement, either do it with (very light) weights or just clench your fists/forearms. Do it slowly (harder). A few sets of 20. I don't even bother with weights and it works a treat. Obviously you can do press-ups too (excellent exercise) but, for me, this one is a little gem for elbows.
And relax. As Whillans said, "It (i.e. your coveted route/s will be there next year. The trick is to make sure you are."
Best wishes,
Mick