China Airlines starting Taipei from 1st December 4 weekly.
They did have LHR slots in recent years, albeit leased. They're not at Gatwick by choice. It seem having struggled at LHR with the economics of the A340, LGW with the A359 won't be much of an improvement, especially given EVA's one stop option will still be at LHR.
Good to see them back in the UK though.