The Department for Energy and Climate change collects and publishes monthly data on production, imports and exports of gas in tables ET 4.2 and ET 4.3 on DECC's energy statistics website:
The tables mentioned above contain provisional 2009 data which show that gross demand (which includes gas exported) was met as follows:
(a) Imports by pipeline 32 per cent.
(b) Imports via liquefied natural gas terminals 10 per cent.
(c) Domestic production 58 per cent.