No. Under EU Block Exemption (still in force in UK law), any independent garage using OE-spec parts and following the manufacturer schedule keeps your warranty valid.
Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.
Do I need stamps in the service book? — Stamps help resale value. A printed invoice with parts and date is legally sufficient under Block Exemption.
What about premium brands? — Same applies — BMW, Mercedes, Audi etc. all subject to Block Exemption rules.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email bob@bobsmechanicalrepairs.co.uk.