I've been thinking about this. I think that 1) they should use 68 + mk5 set to ideally be usable for Dec 24 timetable, to release 165s and 168s for refurbishment and EWR (so the planned 6 196s can still be used by WMR). 2) Then, perhaps coupled with some quadrupling in places, the EMR 222s or give those to XC and use all 221s and make use of the tilt (beyond High Wycombe though as an increased difference in speeds south of there would be detrimental to capacity for both slow and fast trains on a two track line). Either way it would all be temporary as electrification is desperately needed. The downside of being a complete two track line is focus on intercity and long distance detracts from local, and vice versa. It's been at least 9 months and I have heard of no progress on said TPE 68s. It's a shame the mess Chiltern seems to be in these days.