Hello JerseyLily
Yes, you confirmed that Albert's father was William John Lock and that Albert was born in St Sampson, Guernsey 1908/09 (from his marriage certificate to Doreen).
The Bertie I have found on the 1911 Jersey census is noted as being born in Vale, Guernsey 1908 (family seem to have been living in St Sampson's though around the time Bertie would have been born, I believe Vale boarders St Sampson?) and seeing as his father's name was William, it's a promising match.
Problem is that there were at least another 2 William Lock's (born Guernsey & England) floating around the Islands around the same time (one particularly suspicious due having children the same names as my father & 2 of his siblings). Lock seems to have been a difficult name to transcribe correctly, especially the L and the K, so not sure if I've located them all.
Would be really great if I could eliminate the other Williams, thought I could do this by Agnes's Father's name being confirmed as William John (plus the added bonus of Catherine's maiden name).
As always, appreciate your help.