Hi Michael - the deeds/documents submitted are returned to the conveyancer following first registration We only retain the application form and list of documents submitted and copies of those deeds/docs/plans then referred to as being 'filed' on the actual register
You'll need to check with your original conveyancer to see if they have retained anything perhaps.
You may wish to refer them to our blog as well -
Where are my title deeds, and do I need them? – HM Land Registry
DY584262