I don't know if this is possible to do but if it is could someone help me with it.
I am finding now that when your yard is large the default schedule is quit bare, I would like to download a busier schedule mod but to be honest I am not that great with computers and if I did manage to work it out have not got the confidence to try this as if something went wrong worried I would not be able to put it right, so I thought if it was possible to run the UK and Irish schedule along side each other it would solve my problem. If anybody could help I would be very grateful.

Once you've started a game you can't change the schedule anymore. You can change the schedule in any new game, or make your own for a new game in the schedule editor.