I spoke with WS customer services over the phone today. She couldn't find a single Plus seat from LGW to YVR over a 2-week stretch in the Summer, whereas I know there were plenty seats showing as available a couple of weeks ago.

She told me that there are to be some 'schedule changes' to the LGW services, but also that they occasionally run periodic 'inventory checks' which can affect the perceived availability of seats. Her advice was to check back in a day or two.

I can't say I buy the latter of the two explanations offered, so I wonder if they are mitigating against potential equipment changes in the light of the difficulties that the LGW services faced during last season?

Annoying really. I'm keen to book but won't settle for anything less that plus on a 10 hour sector!