Caterp long singular hairs duck egg blue

[shouldbeoutinstead]

would love to be able to upload the photo. Takes too long, (on dial-up), then complains the photo is too large although it is not according to 'properties', so here is a description instead.
Approximately 4.5cm long.
Vertical tuft of gingery hair near head.
From the rear, 10 long, singular hairs either side, close together, with very short tufted white ones on top of the tail end.
There are then about 3 or 4 long hairs at each segment with other shorter ones around those.
Those white hairs are in line with the top, longitudinal band which is white with a duck-egg blue tinge. This runs for approximately 15 bands until interrupted by the side-body colouring, ( dark brown), overlapping to the top.
The off-white resumes in a narrowing pagoda like pattern until further narrowing to a thin line, ending at the head.
Right at the end of the first white line it has a vertical stipple brush.
It appears to have a tail-spike.
There are paired russet-brown splodges at consecutive segments.
Off-white underneath.
Not furry anywhere.
Creeping along uPVC step so no leaf guide.

[Lance Morgan]

Hello there
Almost impossible to identify from description. What time of year was this seen? Sounds like it could be a vapourer moth but pure guess work

[The Woodman]

Hi shouldbeoutinstead

Have a look at this caterpillar on the front page of this pdf guide
http://www.mothscount.org/uploads/caterpillar%20lft.pdf

If it looks like yours then buy Lance Morgan a pint!

[Wild-Woman]

Just tried drawing it from the description and looked through Jim Porter. No Luck.
Perhaps we need a bit more to go on.
Was this a recent discovery so we know if it over-winters at larval stage?
Did it 'loop' along or crawl?
Could you remember what colour the head was and whether it was shiny?
So tufts of hair but not hairy as such?
Can you give us a county/ location eg coastal/ mountain/ habitat? It will rule some out and some in.

By the way welcome! We do like a challenge!