Sheffield-London stock allocation

[222001]

So far for Sheffield to London I have to following list of what stock will be used on which services from the timetable change Monday to Friday.
I was wondering if anybody knows which of the 5 car Meridians will be doubled up to 10 car?. MR5 = 5 car Meridian etc. I hope the 17:27 south is are there could be a bit of overcrowding!

South Stock North Stock
05:27 HST 06:20 MR7 (from Derby)
05:56 HST 06:37 MR5
06:27 HST 07:20 MR7 (from Derby)
06:47 MR5 07:55 MR7
07:27 MR7 08:55 MR7
07:32 HST 09:55 MR7
07:44 HST 10:55 MR5
08:27 MR7 11:55 MR5
09:27 MR5 12:55 MR7
10:27 MR7 13:55 MR7
11:27 MR7 14:55 MR5
12:27 MR7 15:55 MR7
13:27 MR5 16:55 MR7
14:27 MR5 17:55 MR7
15:27 MR5 18:15 HST
16:27 MR7 18:55 MR5
17:27 MR5 19:30 HST
18:27 MR? 19:55 HST
19:27 MR7 20:55 MR7
20:39 MR7 22:25 HST
23:21 MR5

 

[222001]

Now the new timetable has started can anybody help with this. I am interested to know which ones will be doubled up.

 

[tbtc]

Is Sheffield the biggest place to get (just) five coach trains from London at times?