On http://www.ead.eurocontrol.int/pamslight/pdf/4e415453/EG/C/EN/AIP/ENR/EG_ENR_5_4_en you can view and download a useful tool, an air-traffic obstacle list for the UK, in which all structures taller than 100 metres ( 328 ft) should be listed with their pinnacle height. However it contains sometimes outdated height values, e.g. for Belmont TV Mast and sometimes coordinates have to be compared. For example the entry "LFA 14" are the radio masts of Burghead.
Nevertheless, it is a useful tool.