Whilst they probably did have the same colours and type in use at the LONDON Playboy, these really do look like they are the jetons from Portsmouth (it says it at the top perhaps?) and again, I would expect to see the 5/- and the £1 there too, whcih they aren't. Also the size is too "small". Still a great picture but......definitely more likely to be from Portsmouth. I would show them properly but the pictures are not mine.
Oh and I even took on board your comments about the RARE £50 small crown chip too by chaging it to RARE not Unique as I had previously thought as you told me you know of 2 others.
I'm only an amateur telling it as I believe it to be, not an expert.