Hi All,
If you weren't already aware, the British Geological Survey holds a public database of over a million Borehole records around the UK.
http://www.bgs.ac.uk/data/boreholescans/home.html
On my 5 acres alone there was at least 5 records from the 1990's and 1920's going down to around 30 meters. They show a complete detailed record of the composition of the ground, fascinating stuff.