RICS Knowledgebase

UK VPGA 15 of the UK supplement to the Red Book deals with Capitals Gains Tax Valuations

1982 materials

The 1981 Red book that was in effect in 1982 is available on isurv 

This Valuation Office guide from 1982 covers a variety of asset classes and may be of use for your Capital Gains Tax (CGT) valuation 
https://webarchive.nationalarchives.gov.uk/ukgwa/20141002132829/http:/www.voa.gov.uk/dvs/propertyMarketReport/1982/index.html 

Some commercial tools like CoStar also have some historical data 

The RICS library also contains a variety of sources including the Estates Gazette hardcopy issues from 1982. Contact knowledge@rics.org to get in touch with the library.