idk, I couldn't find it on eBay or fellside and you didn't leave any link to what you knew\saw.

Here it is as advertised by "proper music"

Format: Compact Disc
This title will be released on November 30, 2018

Peter put together a cycle of folk, Kipling and other songs on a maritime theme which he called 'The Maritime Suite'. Peter collaborated with Dolly Collins with whom he had worked on previous albums to provide the musical arrangements. With just Dolly's piano and Ursula Pank's 'cello this was the line-up which was featured on BBC Radio 2 performing the suite. Peter toured the show solo using slides to illustrate the performance. This is its first time on general release.

https://www.propermusic.com/product-details/Peter-Bellamy-The-Maritime-Suite-We-Have-Fed-Our-Sea-For-A-Thousand-Years-261296

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there might be other threads which discuss it.