A Goodreads user asked Jasper Fforde:

In Shades of Grey, is Loganberry Jam a jokey metaphor for the logjam block you talk about when writing? Or have I just read far too much into it?

Jasper Fforde No metaphor, just a jam. But since Loganberry is not the traditional jam of choice it makes the offbeat joke have a sort of inbuilt quirkiness. I had a long conversation once with a Taxi Driver in Buenos Aires all about how he thought Lewis Collins was just the best actor imaginable, and wouldn't stop talking about him. If he'd liked, say, Johnny Depp or Ashton Kuchner, the conversation would have been rather dull - but Collins? Pure quirky Gold! (You may have to look him up. Collins is most famous for a TV series called 'The Professionals' which aired in the eighties.) As an aside, you should try loganberry. It's very good. Sort of 'like raspberry but not'

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