The draft contract
Supreme Court judgments
https://www.supremecourt.uk/news/latest-judgments.html
Keep up to date with important new cases conveyancing contracts.
HM Revenue and Customs
www.hmrc.gov.uk
The site for information on any problems about the possible payment of stamp duty land tax (in particular the apportionment of price in the contract between land and chattels).
Land Registry Internet register access
https://www.gov.uk/guidance/digital-registration-service
The location for online applications for official copies of registered title.
Law Commission
https://www.lawcom.gov.uk/
Keep up to date on proposals for law reform.
Law Society
www.lawsociety.org.uk
Information about the Law Society standard form of contracts.
Location statistics
https://www.zoopla.co.uk/
Ordnance Survey
www.ordnancesurvey.co.uk/oswebsite
It might be useful to consult a detailed Ordnance Survey map when drafting descriptions of land in the draft contract (e.g. sales of part).
A street map anywhere in the UK
www.streetmap.co.uk