Thanks for the link! I've just requested to join that group now.
His full name was Petar Grmusa, changed the spelling to Peter when he came to the UK.
My Grandfather's friend (also a yugoslav) told my Mother that my Grampy had changed his age (to make him older) when he moved to the UK, so he wouldn't have to serve in another war. Did this happen a lot? It makes searching for him more difficult as I'm not sure of the actual year he was born. And he also told us, that everyone in the village he lived in had the same surname.. is this likely? I know this is a bit off topic, but you may have more chance of knowing than I do!
He told his children that the buildings where records (births, marriage etc.) were kept near his village was blown up in the war, I think maybe to deter us from looking into his past. I have contacted the Croatian State Archives, but haven't heard anything back yet, not sure where else I could find any information about him.
Thanks for the information Danilo!
Kayleigh