Not looked in detail at the wiring. Not even opened the bag with the wiring!! Did you ask Marlin to find out that they use 5 relays?
Off the top of my head, two relays I can think of are the indicator/hazards and the intermittent wiper.
Are you doing a 1600cc 5EXI?
I'll have a look at the circuit diagrams tonight to see if I can work it out for you.
The Grey blue. Looking at the Marlin diagram, is the heater switch or the fuel guage. I think this might go to the fuel sender unit if it's going to the front of the car.
Not sure on the 5AS at the mo. I know WKC guy got the loom from Marlin and still had problems with different colours etc.