Good shout; I’ll refit the hatch, use some sikaflex to seal against the deck.
I’ve also ordered some of this neoprene cord seal to see if I can replace the seal on the hatch itself (the old one does look very compressed/old):
https://www.ebay.co.uk/itm/114514885885?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Nbjb8xcISWO&sssrc=4429486&ssuid=hYXI_52gTB G&var=414704918941&widget_ver=artemis&media=COPY
I’ve also spotted a Chinese manufactured hatch which at least appears near identical to the original Viking hatch - if all else fails.
https://www.ebay.co.uk/itm/235134094294?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=juwjye3et5e&sssrc=4429486&ssuid=hYXI_52gTB G&var=&widget_ver=artemis&media=COPY
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