According to the Inverarary Maritime Museum website, this puffer was built as the VIC 72 in 1944 at Hull.
VIC stands for Victualling Inshore Craft.
She was operated by Easdale Shipping working out of Ayr and Easdale, and she was the last working Clyde puffer.
In 2001 she was brought to Inverary and in 2006 she was re-registered as Vital Spark.
The puffer which starred in the TV series was VIC 27 renamed Auld Reekie.
Auld Reekie is currently undergoing major restoration work at a boatyard in Crinan, adjacent to the Crinan Canal.
Yes, this puffer was previously known as 'Eilean Eisdeal'. I don't know why she had to be called 'Vital Spark' - we have enough 'sparks' to create a bonfire! So, so predictable and dull - far better to keep the earlier name. Grrrr. Donald.