I was looking for the latest info on this as have to book a London to NYC trip shortly in WT+. The guide only shows which aircraft have the system by registration, and how to identify that once ticketed and able to access the identifier code in MMB. I'm trying to work out if (barring a/c substitutions) it can be verified before the booking process, through the seat map function on either KVS or even in the booking process via the BA "choose your seat" option.

If the guide is to be believed, 80% of the LGW-JFK flights now have a "refreshed" WT+ and upgraded IFE, but I'm really not convinced that's accurate, hence the question...