Garages are under no obligation to provide you with a warranty after completing any repair work.
However, many garages do offer 6- or 12-month warranties to give customers as much peace of mind as possible. It may depend on the garage you choose as to whether they offer you a warranty after your car repair.
If you believe that a garage hasn’t taken ‘reasonable skill and care’ during a repair, you are legally entitled to claim compensation under the Consumer Rights Act of 2015.