Mystery tower in woods

[topographic]

Hi Guys. I'm new here, but I am really enjoying it all. I have a mystery building shown below. It's on a hill, possibly called beacon hill north west of Martlesham in Suffolk. Obviously it's in a hot spot for WWII airfields etc. There are no signs or footpaths near it. I have trawled Google for hours trying to find reference to it. Could it genuinely be a secret tower? What do you think it is?
75077508

[Denis]

Same tower in Flashearth...
devoid of trees though?
http://www.flashearth.com/?lat=52.078308&lon=1.272837&z=19.6&r=0&src=msl

[PETERTHEEATER]

Looks better in Bing Bird's Eye but I can't seem to save the link so here's a grab:

http://i329.photobucket.com/albums/l366/PRACHUAP/MysteryTowerMartlesham.jpg

I reckon it's a modern residence in keeping with the Beacon Hill location.

Had a quick look at the Martlesham Planning Applications archive but it's difficult to pin down.

[OneEighthBit]

The streetview shows a sign saying "Timbers" and a quick google points to a Timbers Guest House, Bealing Road, Martlesham so it could be something to do with them.

[Jenna]

looks very much like an 18th century 'folly', its location is Dunnetts Hill Plantation and may be linked to the nearby and listed Beaconhill House.

http://www.britishlistedbuildings.co.uk/en-285031-beaconhill-house-martlesham

[John Anderson]

A 19th century folly? Any stately homes close by that it could be linked to?

[John Anderson]

Hi Jenna

Great minds-apart from the dating!

[tarkey]

I thnk its the site of a Go Kart racing track

[tarkey]

Sorry got that wrong the track is to the North.

[buccaneer66]

There are reference to a Millenium Tower Folly at Martlesham.