If its the meaning of GVS you're asking about, it's Gas Venting Station, where surplus gas is burnt off: The flame may be invislble in daylight and hot gas/air can rise to quite high levels.
There's one at Bacton 5 miles east of Cromer on the north Norfolk coast where the upper limit is 3,000ft: it's where the N Sea gas comes ashore.
Looks like they've just forgotten to put WCO in their database, and there's a GVS close by, listed as Aylesbury in the UKAIP ENR section.
Last edited by Cusco; 30th Jan 2012 at 11:13.