[MatthewH]

I did this yesterday. I've been having some similar problems with my 4.2L petrol. Some mornings it takes a few minutes to start the car, turning the key just causes a single click in the engine bay. After a few minutes of turning the key the starter motor will finally spin and start the car.

To access the relays, the silver/grey dashboard trims should be removed - the short one to the right of the steering wheel, and the long one to the left that runs to the glovebox. Use a plastic trim removal tool, not a screwdriver - the previous owner of my car broke many of the trim clips and "fixed" them with Blu-tack. Removing these trim pieces will reveal some torx screws which need removing. You can then open the driver door, remove the fuse cover, and remove the last 2 torx screws behind this cover. The panel under the steering wheel can then be dropped down revealing the relays. The main starter relay is the grey 370 on the top-right.

I removed mine and it looked fine visibly, some slight burn marks to the pins but no signs of melted plastic. I cleaned the pins and refitted it, I'll see if it makes any difference.