Thanks again guys! Bleeding has been from the vulva, although it was slight and stopped quite quickly - no blood since yesterday lunchtime. She has been having Glucose/vitamin/hydration drench which is in a sachet mixed with a litre of water and she takes it OK because its quite sweet - literally have to tip it down her though. She is fortunately still with us this morning (I was wondering what I was going to find when I went in the shed). So far cannot get her to eat anything although she is nibbling a bit of hay and picks out the odd sheep nut. She will not have the lambs near her - they try to feed and she pushes them out of the way so we've had to put them in separate pens next to each other. One lamb will take a bottle but the other one is flatly refusing it although they are both eating hay and creep. Just hope that if the ewe recovers, she hasn't dried up.
Spoke to very helpful new vet yesterday evening - said we were basically doing everything they would do, other than put her on a drip which, in the circumstances, might be too stressful as she's so ill, but as she is taking the drench there would be no urgent need for this and she's not bleeding now. But if things look like they are taking a turn for the worst she will come out to her (thankfully). Just going out for more of the drench and lamb mix ... watch this space....