Points well made, HedgehogRescue.
The 'Go-Cat' biscuits I offered were rejected last night, but as you say, my hogs have been unduly spoiled, so will have to learn to find their own stuff in future.
As yet no hog's struggled with a nut - I bash them [the nuts, that is!!] in a mortar with a pestle - and as far as I can hear no one seems to cough/splutter/object to them so far.
On balance I think I'll be more circumspect about peoples' recipe ideas for hogs in future.
I bought a 2.5kg bag of Spikes about a year ago, and I think 4 or 5 of those star-shaped bits have actually been consumed by hedgehogs since that time. That leaves me with 2.498573625 kg remaining.