This £25 and £100, which Id never seen before today, were part of the back-up set at the Victoria (and have been for 15 years)
For the first time, due to high limit cash games in the poker room, and a new baccarat table going in, they have had to use a few in the poker room only until their new stock comes in.
New rack is expected to be delivered within a few weeks, but no new chips will appear until Grosvenor agrees countrywide that its satisfied with the RFID system.
The new chips have been ordered 'centrally' so they dont know whether the low denoms will be the same as the latest Victoria B&G's or the generic Grosvenor B&G's or something else entirely.

As these reserve chips were briefly out of the vault (albeit all accounted for when they returned), the cage manager had an excuse for letting me have these two. Possible I could get more but Id have to be both very nice and very quick

Enjoy!