British Airways in conjunction with codeshares with Cathay Pacific & Qantas are offering cheap fares to UK. Most of these fares seem to be available at Mix & Match. You can fly into one city and flight out another if you plan to explore the UK. All fares include bags, meals and seat selection. Flights have a stopover in Singapore or Hong Kong so may be able to add a stop there as well. Dates are September to November.
Good prices for the less travelled UK cities. London is a decent deal given you are flying BA as opposed to nearby prices with Air China etc.
Find the cheap dates via Google Flights, then put them in Skyscanner and book at Mix&Match.
Newcastle $1208 - Google Flights - Skyscanner
London $1235 - Google Flights - Skyscanner
Glasgow $1208 - Google Flights - Skyscanner
Leeds $1218 - Google Flights - Skyscanner
Manchester $1214 - Google Flights - Skyscanner