Great Western Coffee Shop

Hi all, so I understand due to engineering works the trains from S.Wales to Paddington are picking up at Patchway rather than Bristol Parkway so then presumably going down filton bank and round rhubarb curve.

I am looking at getting the 1653 (1L74) today which shows on realtime trains as 2x5 cars.  I believe patchway platform is only 4 or 5 cars long, so will the train stop with just one unit platformed, or cunningly positioned so that both halves have a couple of coaches platformed?

I also note an operational stop at Bath (presumably for pilot to get off and take the next down working back) so would they normally unlock the doors here (booked 5 mins stop 1712-1717) so that one could move to the other unit if it was just one half platformed at patchway?

{source of info: https://www.realtimetrains.co.uk/service/gb-nr:L64664/2022-01-16/detailed#allox_id=1 }

Patchway is currently doors 1-9 on all formations in both directions, so yes you'll need to be in the front portion.  I imagine the TM will make several announcements and take the opportunity to move any passengers in the wrong portion at Bath Spa.