Were you walking across it or along it?
Er, (consults holiday photos) ... In the case of Devon,
along it, as shown by the red arrow in this picture.
The Scottish decking had a decking ramp leading up to the main flat area. The site owners obviously knew that there was a problem because they had put anti-slip pads on the ramp, so you just slipped over when you walked out onto the flat area instead!
(I can't remember which direction that the decking went there and I haven't got any pictures of it.)
I was wearing mountain bike SPD shoes which have aggressive tread made of a firm material. It is great for grip on soil, dry tarmac and so on. Bloody lethal on wet decking though. Oh, and on damp laminate floors too - I was rolling my bike across my sister's kitchen this morning and spilt water on the floor when I bashed her dog's water bowl. Same result - my feet went from under me and I almost ended up in a heap with a bike on top of me! (I was quite impressed by how quickly a Border Terrier can move when it realises that 16 stone of man and metal is about to land on top of it!
)