As someone who works in Bolton and has played at the G I can help out with any queries.
From Manchester to Bolton on the train takes no more than 15 mins. They run approx every 10 mins from either Manchester Victoria or Manchester Piccadilly.
The casino is less than a 5 minute walk from the train station in Bolton.
You exit out of the main entrance directly in front of you, and straight across the road past the bus station. Follow this main road for a few seconds and you"ll see a Morrisons. About 100m away, you should be able to see a Mecca bingo. The casino shares the building with the Mecca.
If you"re a member at any other G or Grosvenor casino, you just need to fill out a card which takes seconds. You generally even get a personal tour as I did!
If needs be, I can arrange to meet people at the train station and take them across. Will be booking the weekend off work for it.