Thanks. I thought it would be something like that.

Changed it all ok. But someone has done it in the past, the corner of the cover is cracked and one of the bolts has been de threaded at the front. I went to remove it and it just spun freely, been that like that forever I guess. Randomly it was leaking from the back and into the spark plugs, no where near the useless bolt or corner. Hopefully it will be ok. If not, new cover or ebay.

I must stop offering to help people with cars.