110 metres (360 feet) altitude.
from DSCF2782.JPG
horizon 10 to 1 stretched.jpg
https://www.google.co.uk/maps/place/52°25'36.6"N+4°04'50.6"W/@52.4268315,-4.0982318,4469m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d52.426827!4d-4.080731
7 metres altitude...