Kerosene smell in Hotpress

Thanks for the response

Hard to see if there was an overspill, everything is wet outside, but there's nothing obvious.

This seems to have kerosene on the outside, either it spilled on it, or it's weeping

The tank is at the bottom of the garden, the boiler is halfway way up, so no oil pipes near the house, really

I've emptied the hotpress, it's really a kerosene smell.

Could the fumes be coming in along the ducting taking the pipes into the house, if there's a leak at the boiler?

Constant drip, for who knows how long, so I'd say so

Not taking it the wrong way at all. I've done plenty of DIY stuff, car stuff, some electrical, some plumbing, but whenever you're faced with a new job, it's nice to find out the things you don't know that you don't know.

Looks like like a straight forward valve replacement, but I'd prefer not to be elbow deep in the job and have someone say "you mean you didn't do [insert x here] first?"