Oh no! Poorly Denzil!

Denzil, my car, told me it needed more coolant. Unfortunately when I opened the cap to fill the reservoir I found this. :-( I'm waiting to find out what is causing the oil in the coolant reservoir. The oil in the engine is foam free and clean. I'm hoping it's not the head gasket. I've been googling and it could, possibly, fingers crossed, be the oil cooler which I think might be cheaper. The local garages are fully booked until Tuesday and our friendly mechanic has yet to get back to me so watch this space. I'm keeping my fingers crossed for something cheap!