Argh - she seemed better and was staring enviously at Mercedes when I was feeding Mercedes so I gave her a few teaspoons of apple which she kept down. Then she leapt around in her JJ so I thought she was doing better. Gave her a small (50ml) bottle of formula before bed and ended up wearing the whole lot

I guess she's not over it yet.
And Mercedes has got over-production going on at the back end IYGWIM so I think it's definitely a tummy bug
Thanks for all your thoughts and support, it means a lot