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6pt-
I wouldn't bother with a foam gun for one job, just get one with a nozzle.
https://www.screwfix.com/p/soudal-gap-filling-foam-hand-held-750ml/46137
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I'd agree on just using that ready to go Soudal stuff.
For silicone, CT1 is the posh stuff that gets recommended a lot - Screwfix doesn't sell it, but Toolstation does.
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Blue tape to mask off before you start
stevo_com
hvsds
Grumpy_Git
Looks like it was never sealed. I would go with silicone over foam/caulk saver due to the door probably needing to move a bit.