Yes. Is it manned and, if so, by whom?
I can find no link to CG or National Coastwatch. Google maps shows no evidence of cars or parking (but then, the shot is probably old).
Seems to be in good condition.
It was a former Royal Navy range tower. Then it became used by HM Coastguard as a look-out tower - it is now a mobile phone base station - the mock spinnaker or flag mast is actually a mobile phone mast and the building / tower houses all the radio comma and electrical gubbins