Cheers Frank, and it does explain what I was confused about.
On a tangent , ( unlike me I know)
Me and Mrs winter were in the old Richmond Park in Oatlands about 10 years ago when crossing the pedestrian bridge that links the green to Richmond Park ( now demolished to make way for new houses ) broke my heart that did as it was once a beatufil place , now reduced to just the pond and a poxy ( unfair , ill take it back its ok) restaurant , the jenny burn facing shawfield.
We met on the bridge a ( what I considered the real McCoy bird watcher) ornithologist whatever.
He saw I was taking pictures and asked had I seen anything in Richmond Park worth his time to look out for.
½ cut and being but a mere amateur explorer ( I tell Mrs winter to say that if anyone asks what we're up to) seems to work as ridiculous as it's supposed to sound.
I said " aye there's a purple heron right in the middle of the pond fishing"
- " WH...WH...WHAT? A PURPLE HERON ? HERE ? NOW?"
I says aye I'd show you my photies but my phones dead"
" THATS OK " he said as he ran off at top speed with tripods backpacks cameras the works.
2 minutes later as we headed hame Mrs winter says " whit are you talking aboot? That heron was white/grey not purple"
And I suddenly recalled that purple herons , you don't get here but grey ones you do.
" oh well it'll keep him fit and busy for a while"