Hi, I think it's a variety of Phlox, Derek.

it's definitely not a phlox I have phlox and the leaves different

Which variety of Phlox do you have Kaiglen ? I have Paniculata, drumondii, divaricata and subulata.....all the leaves are different.

Phlox was my first thought although the leaves look a bit like a Campion

It could be a double saponaria but it looks a deeper pink than mine or it could be a silene [catchfly].
definitely not a phlox though.

Thank you seaburngirl I have googled it and I think it is silene thanks for your input