Another member has just rigged their boat with webbing slings.
The complete set, including shackles, was under £60.
Round Endless Lifting Slings. https://www.ebay.co.uk/
2 x 3m rated to 3 tonnes
1 x 4m rated to 2 tonnes
Bag of 10 Diall M14 D-shackles. https://www.screwfix.com/