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frankenbike
@Brommers
A BSA bottom bracket fills a BSA68 bottom bracket shell pretty snugly, whether its internal or external bearings. In order to make an eccentric bottom bracket work, you need space so that you can move the bottom bracket around to various points in the bottom bracket shell. In order words, you need a BB which is significantly smaller than the BB shell. Hence why most eccentric BBs are designed to fit into BB30/PF30 shells, which have lots of space.
There's only one eccentric BB which I'm aware of which fits in a BSA68 shell, and that's the delightfully-named Trickstuff Exzentriker. Available from Bike24 for only 135 Euros.
Bottom line - you can't get a square taper eccentric BB for £20. Or anything close.