Number of posts visited so far is 904.
Counties fully completed are:
Sussex ( 44 )
Berkshire ( 14 )
Surrey ( 15 )
Huntingdonshire ( 6 )
Hampshire ( 33 )
Isle of Wight ( 6 )
Anglesey ( 6 )
Flintshire ( 7 )
Merionethshire ( 10 )
Denbighshire ( 10 )
Caernarvonshire ( 15 )
Wiltshire ( 23 )
London ( 8 )
Worcestershire ( 13 )
Gloucestershire ( 19 )
Buckinghamshire ( 11 )
Hertfordshire ( 15 )
Oxfordshire ( 16 )
Herefordshire ( 13 )
Added 1/6/12
Coulsdon Deep Shelter - Surrey
Wetwang
Location: SE927589
Info from the subbrit website:
Although this is listed as an underground post in the book 'Attack Warning Red', being opened in 1960. Research indicates however that Wetwang did not go underground and the grid reference quoted was for an aircraft post only.