A second welcome to the cellar Ogwen. Another Brit in the cellar is sooooo welcome
So you are a player, so you will have gathered that we are not actually adhering to any of the modern tournament rules employing instead more of a creative schema which could I suppose be said to mirror quite closely the British Antarctic Survey system (ii) designed obviously to encourage the circulation as opposed to actual movement. Passion not Perambulation. Sorry
However, I feel sure you will agree that Millennium Dome does present an aesthetic problem in view of its proximity to The Royal Observatory and 'that line...'. So not to put too fine a point on it, and being just a little bit scared of Monster's worrying reference to 'physical force' I am therefore playing a classic Saturday move or 'purl' to the west with
MONUMENT on the Circle. Thereby ends the clue!