Provided that the house ownership is on the Land Registry then the deeds are interesting documents but have no legal standing...being charged 150 a year for storage is a rip off. There might be other useful information in the deeds, eg any covenants limiting what can be done with the property..but if there is any difference between the deeds and the Land registry, without solid proof to the contrary then the Land Registry information will be deemed to be the correct version.
http://www.landreg.go...ocuments/bhist-lr.pdf
If the house has been sold since 1990 it will be on the land registry, other triggers for compulsory registration were added later.