Thanks Gentlemen, this is all super helpful. Tiresias that recipe is just the job. What they have given me is really vague. Guinea - fully agree re the stomach: I actually think the labour is a waste of time, so we will do as below. The recipe's all seem to be very flexible - it's basically a big peasant sausage and a shed load of cheap oats (or breadcrumbs) stops the case from splitting by the looks of it and was a dirt cheap bulking ingredient.
I've had an hour or two discussing this in person with the lady (Sally) setting it all up now. This gives you an idea of the level of knowledge:
Sally, "If I got hold of a big copper stewing cauldron, could we cook it in that for the filming?"
Me: "I only have induction hobs"
Sally "I don't understand"
Me (unvoiced) : "Exactly!".
So, I think what will happen is we will use the outside kitchen, where I can use the fire pit (which normally keeps me warm) if they want flame. We can then pretend to cook it in the cauldron but actually use the big stock pot on the portable induction burner. We will prepare the stomach as prescribed, but in the likelihood that this will be yuk, yuk, yuk and might split, we will have have a dozen beef caps in stock to actually make them in. No liver will be minced. I do have a commercial mincer but I said if they are trying to do this authentically then sticking it all through a noisy electric machine is not the way to go and a big knife is fine.
Weirdly it seems to have turned out to be less hassle to buy a whole sheep than to get fresh pluck from somewhere. £200 - £220 each including butchery, all innards head and blood. Some fresh lamb will be going on the BBQ for the production staff and they are paying for me to have a helper for that purpose. The rest will go in the freezer and Sally gets some as well
Neeps is in fact a beigy shade of orange.

The best thing to do with it is feed it to the pigs and then eat the pigs. This is what we call vegetarian one step removed.
I agree re some colour and crunch. Right now I do a beetroot and celeriac salad made on the slicer, with grain mustard and honey so will make a bucket of that and probably some piz, shallots & savoy.
Sally asked if I would wear a kilt. "Only if you supply it, pay me a modelling fee and danger money for getting frostbite in January". They would have to get one from somewhere, so I doubt that will happen.
