Tough double locking padlock with hardened steel shackle. The popular Oxford HD chain lock is a fantastic mid-range lock. On receipt of your chain lock, note your key number and keep in a safe place.
eBay
XUNTING Heavy Duty Bike Chain Lock Anti-Theft Steel Chain with Nylon Sleeve 360° Rotating Lock for Bicycle E-Bike Motorcycle
Aliexpress UK
High Security - Bicycles are mostly quick-release seats, there are security risks, can easily take away. Wheel and seat distance of 23cm or less, can lock the wheel and seat. -Easy T0 Carry, Compact, and Flexible - The Folding lock fits most bikes, it only weights 575g easy to carry featuring special rivets that make folding easy.
eBay
XUNTING Combination Chain Bike Lock, Anti-Theft Bicycle Security Lock, Heavy Duty Steel Chain for MTB & Road Bikes
Aliexpress UK
The chain is covered by a nylon sheath made for deterring would-be thieves. Hardened steel padlock body -Hardened boron alloy steel closed shackle _Excellent quality. The chain links made of triple heat-treated boron manganese for the ultimate strength in a chain -Narrow inner width of individual links defends against leverage attacks.
eBay
ROCKBROS Portable Bicycle Lock High Security Anti-theft Locks Safety Bike Chain Lock for Motorcycle Electric E-Bike Accessories
Aliexpress UK
The Bell Quick Link Bike Lock is a reliable and secure option for keeping your bike safe while you're out on a ride. Made of durable steel, this 3ft chain lock features a 4 digit combination lock mechanism for added security. The blue colour adds a stylish touch to your bike accessories, while the A security rating ensures that your bike is protected in the UK. Easy to use and effective, this Bell bike lock is a practical choice for cyclists looking to safeguard their ride. The packet is a bit grubby but it doesn’t affect the lock in anywhere. Thank you for looking please check out my other items :-) 
eBay
WEST BIKING Bicycle U Lock MTB Road Bike Safety Anti-theft Chain Lock With 3 Keys Motorcycle Cycling Lock Bicycle Accessories
Aliexpress UK
SPGOOD Bike Lock, 5 digits Resettable Combination Bike Lock. The bicycle lock can be quickly locked, no need to use a key, fast and easy! It adds great convenience to daily use,and we supplied SPGOOD bicycle locks in various colors!
eBay
WEST BIKING Folding Bike Lock Combination Anti-theft Lock Portable E-Bike Heavy Duty Chain Lock Bicycle Cycling Accessories
Aliexpress UK
[Anti-theft] The upgraded lock cylinder has a sophisticated structure and prevents technical unlocking. The 3 keys can be pulled out after being locked to prevent them from being forgotten. 【Anti-saw and anti-cut 】The chain lock body is made of durable steel and covered with black Oxford cloth.
eBay
〔E〕Bike Chain Lock Bicycle Heavy Duty Safety Lock 60CM Metal Anti-theft Mountain Bike Road Motorcycle Scooter Padlock With Key
Aliexpress UK
DUNLOP Bike Chain Lock Bicycle Motorcycle Scooter Antitheft 120cm + 2 Keys Features: - Bicycle protection is used to reduce the risk of the theft of a bicycle, scooter or closing the gate. - It is made of high quality plastic, reducing the chance of mechanical damage to the fastener. - The interior is made of steel chain. - It is covered with a factory-made material sleeve to prevent damage to the painted coating of the bicycle. - The set includes two keys that allow the closure and opening of the security by the owners and persons authorized to do so. Specification: - Length: 120 cm - Chain diameter/thickness: 3 mm - Material: steel, material cover - 2 keys included - Random colour will be sent.
eBay
4 Digit Bike Anti Theft Chain Lock Foldable Mini Cycle Folding Lock Security Steel Lock for Bike Motorcycle Bicycle 1M
Aliexpress UK
WEST BIKING Bike Lock 0.85M Anti-Theft Steel Cable Lock Mountain Bike Foldable Bicycle Lock Four-digit Code Lock Bike Accessories.
eBay
Bicycle Lock Anti-theft Mountain Road Bicycle Wire Chain Lock Key Safety Anti-theft Belt Mounting Bracket Scooter Bicycle Lock
Aliexpress UK