Yellow/gold pond surface film

Question
I have a smallish pond (12ft x 8ft, 2-3 ft deep) and after a number of years with no problems it has recently developed a yellow/gold coloured surface film. The water itself appears slightly orange as well.

There is no sign of 'plant growth' - its just a thin film, like a small oil spill, but yellow. I've had it for about 6 weeks now and it shows no sign of dissipating.

I have tried skimming the surface and even reducing the water volume by 10% and refilling, but it comes back.
So far the frogs don't seem too concerned, but all my newts have moved out.
I don't have any fish.

I'm wondering if it is some sort of algae, or something else.

The pond has some shade, but is reasonably open to the elements.

I'm in Southeast England if that helps!

Please - any suggestions as to cause or cure would be really appreciated.
There are some pictures here - www.rydale.net/pond

Thanks

Answer
Hello Charles!
Looking at the pictures the film seems to be what is commonly referred to as "Pond Scum". This should be fairly easy to get rid off by running a pump for a few weeks to increase oxygen content and applying a good beneficial bacteria product (available in any pond supply store).
This should clear things up so your newts can move back in.
Brigitte