Any question answered...

I'm trying to work out he value of a variable for a function in documentation I have found this.

and

I'm dealing with a single integer of kind 2 which apparently is 4 bytes, I can't find anything about LEN I presume this us just the length of the list so in my case 1*4. Or is there some other computer science this LEN thing could be?

Just from the context, it sounds like thats right.. You need to allocate the size of your the record, which is the sum of the size of its elements, so just 1 * integer_bytesize if there's just one of them.

Out of curiosity, what are you working with?