Thank you
So the outward journey is showing arrival at Crewe P5 (from London) and departure (to Chester from P9 with 14min interchange but the return journey is showing only 10min interchange from P9 to P3 which to me, seems a bit tight - especially if the inbound train from Chester arrives late. I'll have to try again with Avanti's booking, otherwise I might just have to book tickets to Crewe and buy separate tickets to Chester
The 0910 from Euston and 1535 return from Chester are through trains (Voyagers).
Euston-Manchester trains normally use P5 at Crewe, Euston-Liverpool use P6, and southbound they both use P5.
So if you are changing at Crewe using P9, the Euston-Liverpool is an easy cross-platform move at the north end of P6.
Otherwise you need to use the bridge.
There are large lifts but they are quite slow in operation.
The one on the P6-10 island opens into a confusing storage area and P9 is a bit of hike from there and not well signed.
P3 is also a fair hike from the lifts, at the other end of the P1-5 island platform.
P3 also normally hosts the LNWR Birmingham service via Stoke.
TfW trains to/from Chester (a shuttle) are normally good timekeepers, but you might not be impressed by the stock (often 2x153).
Avanti have a few Crewe-Chester services with Voyagers. One day they will restore more of the through London services.