I'm with TJ on this. Abus Granite, LONG, PLUS, motorcycle chain with numerical pad lock.
THATS TWO LOCKS !, yes its all a bit heavy, but I love my bike and MUST KEEP IT !. Riding a heavier bike (33Lbs with locks) means I'm fairly quick when on the ST on my 26Lbs FS 😉
Seem to be a good compromise between cost and protection. Please forgive me, but….NO
Really, get the best, don't compromise. If your bike is worth keeping, then some A-Hole will want to take it. If that happens, you'll be proper gutted, and the £20 you saved on your compromise, won't matter.
Get the best, KEEP your bike.
8)
Solo.