Rick Stein, Porthleven is the only restaurant in the famous chef's Cornish network to remain closed for bookings from July 4.
Rick Stein's Fish in Falmouth, The Cornish Arms in St Merryn, The Seafood Restaurant, Rick Stein's Café and St Petroc's Bistro in Padstow are all open for booking tables from July 4 online and by phone.
When asked why tables cannot be booked for Porthleven, a spokesperson said: "There are no definite dates for Porthleven to open."
The tourism industry has been preparing to resume business following Oliver Dowden, the UK's culture secretary, announcing in early June that tourism could restart on July 4 - as long as it is safe to do so.
With two weeks to go, there is still no definite decision, with Mr Dowden saying on Wednesday: "The next stage is July 4. I very much hope that we’ll be able to stick to that roadmap and we will see tourism return to the UK... but we can only do so when it’s safe."
Cornwall's holiday parks, hotels and guest houses are taking bookings but there is as yet no date for the reopening of pubs.
Stein's restaurants in Barnes, Winchester and Sandbanks are taking bookings. However, the Marlborough restaurant remains closed like Porthleven, with the website saying: "Rick Stein, Marlborough is temporarily closed. We feel it is in the best interest of our teams, customers and the wider community."
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