Glo plug relay is top right of the 4 relays at the bottom of the fuse box

fuse 8 feeds pin 5, then the output is pin 3 a green/orange wire to the 4 plugs.

Like I said, you must have a dead short to ground on the glo-plug circuit to blow the fuse 8 (60a)

I don't think the running fault is caused by the glo plug fuse blowing, personally...

You need to use an ammeter (able to cope with 80+ amps) to save yourself ££££ keep blowing fuses...

What I meant regarding the glo-plug light flashing, is that it acts as an engine management fault light, not just glo-plug operation/faults.