Thanks for the replies. I looked at the pictures and they were definitely not ladybird or lacewing larvae.

I didn't think they were big enough to be flea beetles but when i went to put some in jar to show my mum (who knows much more about gardening than me) they did jump like fleas!

I will have a look on the internet this morning to try and find out if flea beetles do any harm.

Thanks,

Sallyann