Thanks David,
these will be related no doubt, so will not be wasted. Sorry I didn't mention Woburn, I thought it was just the district on FreeBDM and would just confuse the issue!
Let's see, what have I for hints as to where they may be....
Son William married in Aspley Guise in 1845, they hadn't come to Australia yet. Daniel Derby CRUTE married in Salford in 1851, he was in Derbyshire by the 1891 census. Robert married Aspley Guise 1856 - still there 1871, 1881. No idea, I thought they were in Aspley Guise.

Thanks for looking,
Christine
Australia