Insurance values

Hi, I wondered what others do about insuring hi fi.  Many years ago I used to specify full details of Hi Fi system separates from a concern that an insurer would not cover in the event of a claim.  Eventually I was informed that insurers were not concerned about these items as they did not fall within the very narrowly defined list of "high value items" and so providing the overall cover was sufficient, itemised detail was not required.  Hence I stopped providing the detail...
I am now renewing household insurance and noted that the position has changed, and insurers now list "turntables" and "audio equipment" within items of high value to be specified... This has given me a slight problem, in that the system has been in place for a number of years, and although I am aware of the purchase price for components, and could probably track down replacement values for a number of items, there are some specifics that are no longer available, eg:Linn LP12, with armageddon power supply and Naim Aro tonearm, dynavector cartridge  Sorry for the long winded introduction, but I wondered what others do about such items ? how do you determine replacement value ? do you cover through standard household insurance ? Is it worth considering a specialist policy ? Any views/ thoughts would be appreciated.