I wouldn't describe it as under-utilised, except in the sense that you less often have people standing down the aisle in first classI would send the horrid lot on a one way trip to Sims if I could, but alas we are stuck with them for the foreseeable future. Anyway, how busy does 1st class get on XC services? If it is under utilised, and if most formations will be doubled up, could there be scope to make the 1st current 1st class coaches a composite to boost standard capacity?