In case anyone is keeping score... it's upside down for me as well: foreground and ripples at the top of the photo, clear blue sky at the bottom. (Windows 7 Pro, Internet Explorer 8.)
And before somebody asks... no, I'm not viewing it in Australia :-) (USA)
I got to these Ponds at around 1:20 and was videoing till 2:30 when, on this short Winter's day, the low Sun angle started to produce these high sats. Lovely! Yeah, I know it's a bit choccie box, but I've always had a sweet tooth.
the last time i was on hampstead heath was probably early 70's, out tripping (literally) with a bunch of people - your pic certainly has the colours i remember!!!!