Hi All,
Thanks very much for all of the replies, I've found them really interesting and helpful, especially the later addresses and information which seem to show that for whatever reason they were living apart in 1911 it was only temporary, I also found that the house Jenny was shown in, in 1911 Brighton was just a short distance from some other Winn relatives, maybe even one of their houses for Jenny and the boys to have a holiday, who knows.
Having searched without luck for another marriage for Frank between 1899 & 1901, I too have come to the conclusion that Harriet and Jenny probably are the same person.
I still find it quite strange the way the 1911 census form for Frank had been filled out, but I guess it will just remain a mystery.
Thanks again,
David.