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.
Go on... give me some Screwfix links to make it really easy for me.
Expanding foam Gun Sealant ?
@stevo_com started
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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.