Thank you for the responses. I use a Baby Beehinds wool cover. The velcro freaks her out.. It's really not a matter of boosting. I used the same two Wild Childs twice the other night as she wakes when the inside two boosters are wet, though the nappy shell itself is dry. I think I may get her tested for a urinary tract infection just in case as she does get very agitated when her nappy is wet in the day - I thought she was just a princess about it, but maybe it's really uncomfortable - however as soon as the nappy comes off in the day she's immediately happy...
I have a Whizz Kidz, but they don't work for us - she is overly big bummed in it and tips from side to side

- side snappers don't really work for some reason and I found the Whizz Kidz really hard to put on in semi darkness at three in the morning. She sleeps with me so I'm pretty sure she is warm enough - I'm sometimes worried that she's too warm. [sigh]
I have also tried a Krap Katcher, which was OK, but no better or worse than anything else. Maybe I just have to be a bit more proactive and not so lazy and just try and walk her each time rather than feed her.

Don't know what else to do and am scared it's becoming a real habit with her to rely on being fed. Don't get me wrong, I don't mind feeding her, but the NAPPIES!!
(I wrote the above last night but didn't get a chance to post. Last night was five BumGenius and a Snoozywun and a Wild Child). I did find that our changes weren't so fraught when she had been sleeping all cosied up into me - I have been trying to give her her own bit of the bed at the prompting of DP, but although there were a lot of nappies last night, the night wasn't so dramatic as far as the changes went...)