The chef has taken a step back from the kitchen at the £3m restaurant to take on a broader consultancy role across the Living Ventures restaurant group.
The only gastropub to feature in the 2017 Good Food Guide has been granted planning permission to add accommodation and revamp its kitchen with an unconventional chef's table.
The Holborn Dining Room chef is converting his restaurant's deli in to a pie kitchen that will offer his intricately decorated creations to takeaway via an outdoor hatch.
The chef's Padstow-based company is aiming to open more restaurants and fish and chip shops outside Cornwall while developing its strong business in the county.
Allen, who left the Michelin-starred Wild Rabbit in Kingham this year, will open a new restaurant with Select Property Group in central Manchester next spring.
For a full rundown of September's news so far, click here.