I’ve finally found out how to access UK legislation in XML format – http://www.legislation.gov.uk/developer/uris – you just add /data.xml to the end of the statute URI!
E.g. – https://www.legislation.gov.uk/ukpga/1977/37/data.xml .
If anyone wants to play with the legislation you can use the requests and Beautiful Soup libraries in Python to parse the XML. If you want a bit more power you can use lxml.
IP Chimp 