Well we have finally decided not to get another dog. Our boys are so happy and the balance is so perfect that I feel it is too much of a risk to add another into the mix.
Our dogs have never chewed, marked or scratched ANYWHERE and we have just finished doing our house up with all nice new floors and furniture and from a selfish point of view I don't want it wrecked ;-)

We realise that we have actually been very lucky, our garden is immaculate and apart from the hairs, beds and snoring you would never know we even owned dogs lol!

Thanks for all the advice, we will let our boys see their lives out with us and then hope that we could get another 1 or 2 who would give us as much pleasure and love as our 2 do.