(INJ) Yeah, a bit "forceful" (as usual) but I was annoyed that I'd wasted time and thought with no chance whatever of hitting on the answer. The only Bedfordshire Clanger I can think of is the management of Luton Town FC.

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This is obviously going to be one of those perennial debates here. There is room to disagree about where to draw the lines, but this is an online forum, which does make it different playing AVMA here rather than as a parlour game. I don't think there is any harm in subjects that require a bit of googling. As indeed this next one might for some people; I don't know.

MINERAL

(On reflection, this almost certainly has a significant VEGETABLE component as well.)

Fossilised? No.

Used in construction? No.

Natural? In the sense in which I presume you mean the term, No.

Here is a clarification of the category that will hopefully make things nicely more muddled. :-)
The words on the card refer to something that can be reasonably interpreted relatively narrowly, or a bit more broadly. In both cases we are talking about something primarily mineral, and I can do no more than make educated guesses about the vegetable component. Under the narrow definition, my guess is that the vegetable component is present, but small. Under the broader definition, the vegetable component is surely more prominent, but the mineral component still clearly dominates.

(To be honest, you will probably make more progress if you ignore the vegetable component.)

Bog standard food for steam locos.

Diesel substitute? No.