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Correct.

Please look at these statements
(i) The greatest 4-letter prime allowed is MCCI = 1201
(ii) t > 280

Is (i) wrong?
Is (ii) wrong?
Are both wrong?

I am having trouble solving
d = Vt + c + n

(i) is wrong

Thanks, Candledave.
I had ruled out entries with both D & M but of course such an entry can appear in two clues.
Doh!

The greatest 4-letter prime allowed is 1601. After that you get 2 Ms

buzzb

I think you would be allowed to put MCMI = 1901 at 5d because one M would also be in 9a or at 2d because one M would also be in 1a, etc.

It is not the preamble but the other entries that foil this.

Silly - please ignore there can't be 2 Ms

After a monumental struggle, which as usual had a couple of false starts, I have finally completed this. I did have a major scare when I could not fit two of the five digit entries but then I spotted that some of the 3 digit and four digit entries could be placed in 2 ways. I thought that a further equation to eliminate the permutations of e,f,g,h & k would have eliminated a lot of frustrating blind alleys, but overall an excellent puzzle. In my opinion this is more a logic puzzle than a maths puzzle. I now need to double check my grid...........................

I thought this was excellent. Had a worry about fitting in m as I couldn't see how that could work for a while but then the penny dropped.

Just right for a numerical - couple of hours on the edge of it all unravelling then all dropped nicely into place at the end.

I thought this wasn't as difficult as the previous two or three numericals although I couldn't have done it without Tatters' grid on the other thread.
As gitto says, more of a logic problem but enjoyable nonetheless.