Well, if my next trip to Blackpool North (first trip up there since September 2014) is with Grand Central then arriving on a Class 90-hauled Mark 4 will be the biggest most spacious train I've arrived on.
I'd love it if the 90-hauled Mark 4's were called InterCity 175's or 110's - 175's for 175kph and 110 for 110mph as I understand these are restricted to 110mph operation.
I wonder if the front coach behind the Class 90 will be the Quiet Coach - either way I hope there's an option, when booking online, to select the coach by the Class 90. One advantage of this is you're near the station entrance which is really useful if having heavy luggage!
I'll be tempted to, from Oxford, to go via Milton Keynes on the X5 to MK Central rail station then GC service to Blackpool North from there. The 12:10 will suit me as if cancelled there's the 13:10
!