Found this whilst trolling Google Flights for good deals ex London:

https://www.google.com/flights?lite=...834*.GBP.28734

Dates seem to be relatively wide open from January through May. Tickets are Economy Light (read normal economy for *A Gold members), should net you 100% milage on UA. Unsure what the CPM is but would expect it to be at the very least a respectable deal.

Safe Travels,

James