I would like to thank everyone who replied and gave me advice
I had to decide this afternoon because the shop would only exchange today and was closing at 6pm, and the shop is some distance from us.
The nervous guinea pig nipped the other one several times after i had to log off and that made my mind up.
We took them back to the shop and the staff said they would exchange but that the other Abbisynthian had been sold so we went to look at the pen and out came the other Abbisynthian the sister of our guinea pig!
I never imagined that it would make so much difference buying different types from litters(they were mixed in the shop)
The nervous one(pickle) will now be reunited with some from her litter that were left in the shop.
The difference is unbelievable
So we (well the dd's)are the proud owners of Peppa and Pippa!
Thanks again to those that helped.
xxx