Hi,
Not had a chance to speak to anyone just yet, I'll hopefully get a chance this week. It sounds as though you might need it relatively quickly, so the only thing I can suggest is ringing around via some freight handler/Air Cargo type agents in Houston and around the Airport area where many will likely be located. Ring around as you'll likely be told that they're full etc. Some will also say to get a lower price, you should go for sea shipping.
How quickly do you need it in the UK?
Cheers, DtM, West London & Slough UK!