your welcome.

The strange thing was when I bench tested the board I could not find a fault.
I replaced the mosfet with one that has a higher amp rating, the i.c. that controls it and the cap that is across it in case one of them was failing under load.

the desc ription of the fault was the coil would fire when it was supposed to but it would then blow the fuse yet the coil and diode were testing fine

I also supplied a couple of good quality 250ma slow blow fuses in case it was a batch of bad fuses. (but I wonder what blew the original fuse? I assume the coil was firing then locking on)

I am glad you have learned how to check for some faults your self also