Answers
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Near a cupboard (mind the spark!),
Is a little round, grey mark.
what lettering does it have?
eabm (circular marker to
right of electricity cabinet)
This is an
Environment
Agency
Bench
Mark. "Benchmarks" are a precisely-measured height above sea level, used by surveyors and (in the case of the Environment Agency) hydrologists and geologists. A
national database details all the EA benchmarks, their exact location and heights. Scientists can then re-measure to check for ground movement or changes in sea level, and use the benchmarks as a "known spot" for taking other measurements from. Benchmark "spotting" is a popular, if niche, hobby and there is even a website (co-incidentally created by yours truly!) for logging your visits to EA benchmarks at
EABM.DerekTP.co.uk
Cross back over road;
continue W., then left into Horsecliffe
Lane; up ramp. 
S.