They were more than likely 90's.

91's are the loco's (power & d.v.t) for IC225 sets and EWS own none.

There is a chance they could have been 92's but these are few & far between used mainly for the channel tunnel freight crossings.

I'd be suprized if someone was sacked for that oversight as there was a lengthy procedure before the sets were ordered.

Also,they are available in 5 car sets and,of course can be coupled into 8, 9 and 10 car sets.

Engine/mechanics wise they are quite reliable - however,they do have lots of niggling problems with electronics.