VS137 is usually an A35K, occasionally an A333 or A346.
Of the A330s, all were flying or away from base on the afternoon of the 18th, so it must have been a very rapid repair ...
Edit: Just seen the above post, if an A35K it was presumably G-VPOP, which was static at LHR from the 18th to the 22nd while the tin-bashers did their thing.