I have examples of the 4 main No.4 spike types + a repro Sten spike. I don't have all the manufacturer variations - goodness knows where I'd put them all...
(Whilst not a spike but it's in the Priest book, I also have a No.7 which I got in a swap many years ago for 2 AK-47 bayonets. The other chap is probably still kicking himself)