An original Rabone and Chesterman Surveyors measure (because of the links and length 66ft 100 links)
Buy this and measure everything in Links. Then go to B&Q (or your favourite large DIY store) and ask the millennial working there for the lengths of wood you need in Links.
When they look confused tell them this...

The unit is based on Gunter's* chain, a metal chain 66 feet long with 100 links, that was formerly used in land surveying. Even after the original tool was replaced by later instruments of higher precision, the unit was commonly used throughout the English-speaking world, for example in the United States customary units and the Imperial system. The length of the foot, and hence the link, varied slightly from place to place and time to time. In modern times the difference between the US survey foot and the international foot is two parts per million. The link fell out of general use in the 20th century.

Join the Rescued4You campaign to "Bring Back The Links" **

**tbh when I first saw it, I thought perhaps they used to measure things in sausages 

*not the guy that owns the coffee shop in Friends - I checked.

Now over to aBay for her opinion....

This vintage tape measure from Rabone Chesterman is a true collectable for the woodworking enthusiast. Made from high-quality leather and brass, it features a windable design that allows for easy and precise measuring of up to 66ft or 100 links. The tape measure has a unique design that makes it perfect for both professionals and hobbyists alike. It is a vintage original, manufactured in the United Kingdom, and has been well-preserved over the years. Whether you're looking to add to your tool collection or simply appreciate the quality and craftsmanship of vintage tools, this Rabone Chesterman tape measure is an excellent choice.