Further up the thread, it was mentioned that the 1bws ticket was valid in Cheshire West and Chester.
That's only true for through journeys on cross-border buses from Wales, which terminate at Chester and Ellesmere Port.
There used to be others (eg Broughton to I think Leasowe on the Wirral), but not sure if that still runs.
These are the same rules as for the Welsh concessionary bus pass.
For instance you can't use 1bws to travel from Hough Green (just in England) to Chester Station on the same bus as those who boarded in Wales.
English concession tickets are valid for that trip, but not Welsh ones!
The reason for the Welsh spelling of "bws" is because if it stayed as "bus" the Welsh would pronounce it as "bis".
It's the same for words like "ambiwlans" for "ambulance".
It's not difficult, they are same words in Welsh orthography.
Granted, it gets more complicated for plurals and place names, and anywhere that demands mutations....