Western questions from a novice - headcodes?

Pennine MC

Western Thunderer
. If 1M06 and 1M18 are for services in the same WTT then the Chester arrival must have been a very early departure from PDN.

Thinking on, that 1M06 was a Bradford Barton caption;) Although it was Mk1 stock, it could have been the early morning Leamington - Birkenhead working, which I think might have been included in the Western diagrams.
 
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