HD you are totally correct... however there are other controllers at TC besides Heathrow ones!!
It would have been the Area Bods.... TC North TC South or TC East (TC OCK most likely inferring from the first post) and NOT LHR TC Directors.
The directors, although also bothered by weather (and doing an admirable job I might add, having been working radar on the day in question), do not tend to vector A/C
all round southern England
If I had a pound for the amount of times i've been called either Heathrow
App/Deps or Gatwick Approach/Deps by A/C I would be a rich man!
A/C on the day in question were not able to hold at OCK, BIG, LAM or even TIGER so were being held at random places, with lots of coordination taking place between Area and LHR Dir. The area guys kept the A/C in the 'stack' and transferred them to Dir when they were called on.