Thank you everyone. The screen took me about a year, on and off.
I've cut everything to the same size, laid it out to get the squares in an order I like. I'm in the process of washing all the squares again as some have been in storage a long time, soak in very hot water and Biotex, roll in a towel and the iron with a hot iron on the wrong side, it works really well so I can't see washing it will be a problem in the future.
I'm just waiting for the batting and the backing fabric to arrive, plain white cotton as I don't want to detract from the squares.
I have enough squares for another quilt too - oh boy!
Hopefully I can post an update by the end of the week - the joys of being retired