Girl I had Horace from said he was due a feed today, so tried him... and he took it!
He amazes me considering we only got him on Saturday, put him in a new (to us) viv on Sunday and he fed today. He is so laid back he is almost horizontal!
After his feed, he spent the next 15 mins wandering round viv climbing all over everything and trying to get out before settling into one of his hides to digest - no sign of him since... bless.
vid not very good I'm afraid, and I am certain there was nothing in feeding tank when we put him in there, but at the end, there appears to be something sticking to the pinkie.... hope its just a bit of innards, as I had cut into pinkie to try to ensure he'd be interested.