Sorry about not responding to your PM (that I specifically requested
). I recognized the chips immediately, but wanted to check out the origins of the set. That led me to revisiting an old poker chip forum, which led me to reading posts about the original poker chip forum and its horrible demise and actual disappearance (all the material has been lost). That rabbit hole made me hesitant to reconnect and ask the right people about the nature of this set.
I do know that your set is comprised of the dreaded "Dice Chips".
These chips are injection molded plastic chips with a metal slug in the center. They have been customized with a hotstamp for denominations and the GPT logo. These chips are, for all intents and purposes, worthless from a collector's point of view. The case, though small, may have collector's value due to its link to a known (?) poker tour. Chip sets that are valued by collectors of playable sets are almost always "compressed clay", "ceramic", or vinyl. Note that there is little or no clay in the compressed clay chips nor the ceramics. I
think that vinyl chips may actually contain a significant amount of vinyl - or not.
I suppose these chips could have some collector value if they were actually used on the tour. An image search of "Grosvenor UK Poker Tour" results in some other injection molded, slugged chips on the table:
View attachment 265422
The ones pictured are of about the same quality as dice chips, a little better, and they allow for stickers that mimic inlays on compressed clay chips so there is no need to hotstamp a plastic chip.
Your chips are completely functional for a home game. My only concern is the breakdown. It looks like you have:
T10 100X
T25 50X
T50 50X
T100 50X
T500 50X
Denominations are most conveniently increased by 4X and 5X jumps. Typically 1,5,25,100,500. Sometimes bigger chips have smaller jumps like 500, 1000, but generally for ease of play it's 4X or 5X.