Those billions amount to a mere £18,000,000,000m, chicken feed in terms of London infastructure spend.
£18,000,000,000m is £18,000,000,000,000,000.
Any reasons given why BA is pulling Chengdu? It didn't seem to be a 'major' city in China (though I know it probably has a huge population), so I wonder why it was chosen in the first place.