The surveyor has ben and what a sweetie. Found nothing wrong, gave me a good price and is sending the report directly to my notaire. He has reassured me about the Water Justificatif also - apparently it is not needed for the Compromis de Vente so Veolia being unable to give me a rv till 23rd of August need not delay matters as much as I had feared.
He left this chart with me to clear up the (complicated OF COURSE, being in France) Validity times.
ALSO a house has come up in the uk which seems "ideal" for me
Large gin and tonic beckons