FM sorry should have read through it all without going for tea in between, have edited it now to make sense.I gained my ground examiners ticket to do ground school which does help, and the ability to sign SEPs gets you into the school and in front of them, not sure what experience you need to get the GRE rating, think it maybe a paperwork exercise, but the form did ask for licence and experience, I actually love groundschool and as others have said it can pay quite well, look at google people are charging £1000.00 for a 5 day PPL course, ATPL GI could earn 35Kpa before the training industry went up the spout. I know because I was being interviewed for such a role before one certain FTO went belly up.