Assuming the property is registered at the Land Registry your solicitor will almost certainly be able to deal with the conveyancing without needing any other title documents.
However, particularly for older properties the deeds file can still be an important set of documents (it is not, as Mustafa says, the deeds that have been done away with, but their use in day to day conveyancing). I have been involved in many property transactions where information from documents in the deed file was essential. Not all information is shown on the Land Registry entry which - like any other human endeavour - is not immune to error. There is also, for older properties, the value of deeds for historical research purposes.
Unfortunately, in my opinion, there is an increasing tendency to treat deeds as unimportant and even to allow them to be destroyed.