It’s been possible for a while, but incase you don’t know you can find out prices of houses before 2000 at this site:
This is great news because it means you are more likely to find out a previous price of the exact house you are looking at in an auction, not just a neighbour.
Does it matter that it’s old data? No it is possible to correlate from a 1995 price to what you think it would be worth now, although there is a greater likelyhood of “improvements” or “disimprovements” in the meantime.
Ignore this bit (To help people find this useful information I have included these search engine phrases).
House prices before 1998
House prices before 1999
House prices before 2000
House prices before 2001
House prices before 2002
House prices before 2003

