CHONGQING not CHENGDU !!!

But there is a Visa office though nothing to do with the embassy or consulates

<a href="http://www.fco.gov.uk/en/travel-and-living-abroad/find-an-embassy/asia-and-oceania/cultural-education-chongqing" rel="nofollow" target="_blank">www.fco.gov.uk/[...]</a>