I asked my RFD about this last year and they said although they are required to keep a record, it is only held by that RFD and not added to any database. Moderators/silencers fall into this too. They did say they have had the Police come in a few times over the years to ask to see the records where they have been investigating a particular gun/rifle that had been used in an 'illegal' situation/instant. Of course this is all well and good if the original owner still owns it. However, chances are it will have been sold on/passed on or stolen since the original purchase.
HW77K .22, HW100KT .22, HW95K .22. AA TX200 MK3 .22. AA S410 MK3 .177. HW80 .25 HW30S .22. Pistols: Walther CP88 .177, Hatsan Mod25 Supercharger .22, HW45 Silver Star .177, Webley Alecto .177, SMK Victory CP2 .22