Yes, but do they have to be that size to produce those sorts of meals? Genuine question.
I expect even the DfT might have talked to people who know about these things before signing the contracts
Just to provide storage space for catering supplies, ovens and boilers and prep space on the HT and TPE sets is taking up two-thirds of the space of the large kitchen areas, so I would think chefs and crews plating up a lot of breakfast or dinner orders probably do need the extra room and kit on GWR and LNER.
The kitchens on GWR are used only for the handful of restaurant services during the day. None operate PAD-BRI,PAD-GMV or PAD-EXD and vice versa. Therefore £1Ks of equiptment gets dragged around needlessly throughout the day. AFIK GWR no longer offers hot food of any kind on its non dining services. How would you order hot food from a trolley in coach A when only one steward is provided who desperately tries to split their time between 1st and STD.
DfT made the design choices - and if GWR or a future franchisee ever decided to go down the same route as the East and West Coasts TOCs have done with their first class complimentary offers, then more trains might be in need of big kitchens more of the time.
Also, after all the shenanigans there used to be about making sure that a GWR HST set with the right sort of kitchen kit needed for the Pullman services was diagrammed on them, building a few IETs with big kitchens and trying to keep them on Pullmans, with no back-up available, would end in tears at some point.
Hot food should be available to order from GWR trolleys.
Bacon rolls have been on sale on morning peak trains for quite some time and other items now seem to be offered on some services the rest of the day.
But provision is erratic, whether that is due to availability of stock or the enthusiasm or otherwise of personnel on individual services, I don't know. It is high time GWR got its act together on ensuring that there is consistent provision across the board throughout the day.