As it’s panto season I thought I’d share these Selcol flexidisc versions here.  Discogs describes Selcol as a ‘UK plastics manufacturer active during the 1950s and 1960s.’
The discs are made from what seems like a very soft, light plastic film (compared to other flexidiscs) backed with printed card.
You can see they have ‘Cut here’ printed on the sides to indicate they were originally cut from something larger, but I dont know what..  I was quite surprised how playable they are though!