Thanks all. I thought it was a sycamore but I only glanced at the leaves tbh. I'll check tomorrow, will photo leaves if I'm in any doubt. I saw the Alfred Cake thingys online but they looked almost sooty, very different from this weird growth. The first time I saw it, it was raining heavily so it was wet. It looked almost translucent, jelly like, with a sort of structure to be seen beneath. I was really surprised how solid it was when I poked it. To be updated!
Oh, re the slug, I've kept giant land snails before, so I was aware of their strange mating habits. Attenborough narrated a couple of them twirling in trees being amorous in one of his old series, but those leopard slugs were not in the UK, they were somewhere much warmer and were massive, about a foot long if I recall. If you ever wanted to witness a snail/slug orgy, all you have to do is collect a bunch of them, stick 'em in a tub and watch in wonder as they all grow willies out their necks and start stabbing each other with them. Then a week later, tiny snails, everywhere! It's fascinating. Some might say gross but I say fascinating! Anyways, cheers, I'll be back!
