BRIDOL is the British Sundial Society's Register of Fixed and Mass Dials, which gives detail and photographs of about 8000 fixed sundials and 3000 mass dials in the UK.
Some of these are in private gardens, but the majority are publicly available.
Roman numerals I - IIII - VII (upper edge), and I - IIII - VIII (lower edge). Dial plate appears to be made of two separate pieces of stone, interlocked. House under restoration (May 2007).
2008
Hartwell Grange, Irnham Park, Irnham, Lincolnshire
