Bit of a wild shot here ... but does anyone have a recommendation of where to get a decent Cornish pasty (served warm) near LHR?

My wife (Chinese) has decided that this pretty much is her favorite UK food (with the exception of a fried breakfast - but we already have that covered the next day) and we have an overnight stopover coming up in Jan where we will need to grab dinner somewhere.

I haven't booked a hotel yet so am open to suggestions, and no problem to walk up to a mile (actually a decent walk would be good after the long Beijing to London flight) from a hotel to a pub/restaurant if anyone has seen a place with this on the menu. Thanks!