Loose Fill Insulation for cavity wall space (Leasowe CH46)

Bit of a long shot but would anyone have a bag of cavity wall loose fill insulation going spare?

Just enough to fill a small space where bricks had to be taken out for a repair. When I've contacted suppliers they say it is only sold to approved installers. I only need about one large carrier/bin bag I'd guess not a whole house amount so installers not interested in installing such a small amount..
Anyone able to help on this? Many thanks