Thanks Jazz, to be honest I can't follow that very easily on a Monday night after a few beers. I'm sure it will help others when they search though so thanks for taking the time.

I did manage to get the Dolphin PartMaster repeat option to work just now though! For those who might need to know, you start the sequence with the repeat menu option and the radio button set to 'start sequence and enter your offsets. Then you need to go to the end point of what you want to repeat and do the exact same repeat menu option but this time switch the radio button to 'end sequence'. Ignore the other settings this time since it is the end of the sequence the offsets don't need to be set. This probably seems really obvious having done it, but for some reason I wasn't getting it, I think mostly because I didn't expect to use the same menu button to mark the start and one to mark the end.