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Ah thank you. The sample pack of the stuff that Stevo suggested arrived today but I think I do have another trip to Screwfix in my life soon!
Howard-
The Aq21 is the probable reasonable fit thats available in small quantities. There's hundreds available if you want to order a 100m reel.
I have most of a reel of Exitex 8mm joinery seal left. It has a double barb unlike the upvc seals. With the position of your rebate, I don't think it's the best choice but your welcome to some if the link above isn't working out.
user69121
Sorry for the late reply.
This is often used on timber frames with a rebate cut to take a seal barb.
https://www.screwfix.com/p/schlegel-aq21-window-door-seal-white-15m/2822P
The arrow headed rubber seals need to press into a C shaped slot, so the barbs can open out and hold it in
Stick on works to a degree bit it's a bit shit overall.