ONGUARD Brute lock, £41.99,

Brute by name… impressively this US-made lock sports a whopping 16.8mm hardened steel shackle and a ‘Quattro’ 
bolt mechanism which grips it on four sides. Another feature called ‘BumpBlok’ makes the cylinder resistant to pick, pull and drill attacks, plus there’s a rotating dustcover. For the absent-minded you get five laser-cut keys (one with integral light) and the mounting system offers multi-positions and quick-release. Other than the fact that it rattled annoyingly on bumpy tarmac, this is the best value security on test. 
This is the longer of two available sizes.