« Reply #4 on: Thursday 18 October 07 16:28 BST (UK) »
Another idea: if you know the full given names and precise date of birth then (if the person died or is likely to have died in Eng/Wales between 1984 and 2005) you can search the England and Wales Death Index by given name and birthdate alone; any perfect match may give you a clue to a possible marriage which could be researched further using the surname at death.
Obviously this works best if the given names were unusual - if she was a Mary Ann it probably isn't worth bothering with

Anna
Ayr: Barnes, Wylie
Caithness: MacGregor
Essex: Eldred (Pebmarsh)
Gloucs: Timbrell (Winchcomb)
Hants: Stares (Wickham)
Lincs: Maw, Jackson (Epworth, Belton)
London: Pierce
Suffolk: Markham (Framlingham)
Surrey: Gosling (Richmond)
Wilts: Matthews, Tarrant (Calne, Preshute)
Worcs: Milward (Redditch)
Yorks: Beaumont, Crook, Moore, Styring (Huddersfield); Middleton (Church Fenton); Exley, Gelder (High Hoyland); Barnes, Birchinall (Sheffield); Kenyon, Wood (Cumberworth/Denby Dale)