Yes, that may be a better explanation of this. Not so sure if it's enough of a substantial variation to warrant adding to the catalogue though, but I am now starting to compare all of my £1 edges to see if there are any more.
Indeed, fake £1s are relatively easy to spot, as the vast majority have poor definition across most of the surface detail. However, any edge lettering tends to be very irregular as it was quite difficult to recreate the lètters used by the Royal Mint and get them lined up straight - therefore easy to spot from the side. For that reason, most forgers tended to use issues with a non worded edge (i.e the bridges issues ). The coins pictured are definitely genuine.
I have a number of examples of forged £1 coins and interestingly they all tend to feel quite soapy.
If proven not fake, then feel free to send modification request to a referee for commen addition. I think however that this is just part of manufacturing.