BA92 YYZ-LHR Diversion June 22
 

BA92 (or 5CA), a B744 (G-CIVJ), departed Toronto Pearson (YYZ) at 2257Z on June 22, bound for London Heathrow (LHR). About an hour into the flight, they made a U-turn over Quebec Province and headed back towards Toronto. They requested 33R be made available at YYZ because they would be landing at "maximum weight". About 30 mins later, they decided to divert to Montreal Trudeau (YUL) and advised Montreal Centre that they carried certain cargo in a particular compartment - a configuration that was not acceptable to the company. I don't know if the cargo had to be offloaded or merely shifted. The aircraft landed at YUL at 0048Z. It took off for London at 0226Z and landed safely at LHR at 0842Z.
No mention of this diversion has been made by The Aviation Herald. BA Source mentions a "technical issue" but reports talk of a possible "security alert".
Does anyone have any more information on this rather costly diversion?

So, basically, a non event. Please tell me why you posted this on this forum?

Come on. A rather unusual diversion and landing because of some cargo issue? It sounds interesting to me. Was it because of a HAZMAT fear? Lithium batteries? A bomb threat? Someone's dog being loaded without water? Any of these reasons would be of interest. I would say that the OP's question has certainly as much validity for entry into a R&N forum as the typical one. Inquiring minds would like to know.

Could well have an inadvertent contravention of IATA DG regulations, for example loading two incompatible classes in the same hold, discovered only after departure.

Might have got a bit more exciting if they hadn't diverted. :O

Other explanations are available.

Sounds like incompatible DGR loaded next to each other/in same hold to me