Reddit mentions of Abus 410 Ultra U Lock, 9", Ultra 410 w/ Cobra Cable

1. What kind of bike is it?
    
   
   
2. Where are you locking it up and for how long?
   
    
   
   In general you want a decent u-lock like one from Abus that will fit around the seat tube, rear wheel and whatever you're securing the bike to. I don't recommend Kryptonite locks, because they tend to be a lot heavier than the competition, yet not really more secure. Also get a 7-foot flexible steel cable to wrap around components you think might be stripped off the bike if left unattended.
   
    
   
   This Amazon link comes with both.

Happy to help! Ask as many questions as you need. :)
I don't want to make it seem daunting - a good ulock will get you far - so don't let me worry you too much. But in the interest of arming you with the best info:

• Definitely check with your work/office/school to see if they have any kind of bike cage or similar that you can get access to. You'll still want a u-lock there, but it helps to have that extra layer of security.
  
  
• Of course, no lock is theft proof (enough time with a crow bar and saw or a short amount of time with a battery operated angle grinder, and you're hooped) but if yours is at least a little more inconvenient to wrestle free than others nearby, you stand a better chance. Just enough to make it a pain. I like to use a u-lock on my frame and rear wheel (worth more $$ than a front wheel as it has the gears involved) and a secondary cable lock on the front wheel looped through the frame & ulock.
  
  
• A secondary lock (another ulock or cable depending on the circumstances) is especially important if you have quick-release wheels.
  
  
  
  
• How you lock up and what you lock up to matters as much as what lock you use. A really nice u-lock isn't going to do you much good if you're locking just the frame (or forbid, just one wheel!) or locking to a wobbly pole (thieves will loosen the bolts that keep most signs and metal posts in the ground for easy pickings. Throw a hip against anything you plan to lock to to make sure it doesn't wiggle!) Smaller u-locks are safer (less of a gap for leverage with crowbars and the like) but make it harder to find something to lock to if they're too small.
  
  This is a good guide for how to lock up:https://sfbike.org/wp-content/uploads/2017/01/locking-graphic-01.png
  And a fun video from a classic series where a guy goes around grading cyclists' locking jobs: https://youtu.be/IR8jdnsP4Tc?t=68
  
  As to the ulock itself? I've been pretty happy with this Krytonite lock It's at the same level as this Abus lock: https://www.amazon.ca/Abus-Ultra-Cobra-U-Lock-cable/dp/B00PHVVKHO/ref=sr_1_4?dchild=1&keywords=abus&qid=1574406052&s=sports&sr=1-4
  If you have a more expensive bike, you can go for something in the $100 lock range, but otherwise this one has served me well.
  
  Good and relatively inexpensive bike repair shops? I've always been happy with the service I've had from Velo Star Cafe (formerly Tandem Bike Cafe) at Heather & 16th (rather near VGH). Fair prices and reliable friendly service. I've also had good experiences and really great deals from the "Bike Repair Centre" on Broadway just west of Main St. Not bargain basement but friendly and honest and you feel like you aren't going to have to bring your bike back to have someone fix something they messed up. For DIY options (with help!) and spare used parts bins galore, Our Community Bikes at Main & Broadway is a solid standby. It's a community space where you can learn to repair things with help. It can feel a bit chaotic in there and there can be a wait to ask questions or get a stand, but sometimes you can't beat learning a few basic things and coming out the other side with a better functioning bike.

I had that in mind, found this on Amazon for £25, does it seem alright?: https://www.amazon.co.uk/gp/product/B00PHVVKHO/ref=ox_sc_act_title_2?smid=A32CWL50OXRGYH&psc=1