It is one of the 8-coach sets used on the fastest King Cross to Newcastle, Leeds, Bradford & Harrogate business services. Formation was 3TSO, RB, RU, 2FO, BFK although in the photo there is an RMB substituting for a non-available RB. First class had meal at seat service in the 2FO's hence the 2 catering cars to service the high demand. The most obvious candidate in the photo I guess would be the 11:25 KX-Leeds/Harrogate.