I am asking the expert how safe is the group santander to make a saving investment with Abbey now part of that group

This thread I came across, may help.

http://www.moneysupermarket.com/community/forums/t/fscs-compensation-36051.aspx

It's a good question, Daysh. You'll find the following article by Clare, our site editor, of interest:

How safe is your bank?

I hope that helps.