The Sheffield-based company has been servicing the needs of the AA for 18 months - in a deal worth £40 million over three years - and each of its 52 branches are responsible for delivering a parts supply service to the AA's network of patrols.
And in order to monitor the quality of the service it is providing, LSUK and the AA established its national awards scheme. Tunbridge Wells scooped the top prize after receiving the best feedback from the AA patrols working in the Kent area.
Each branch was judged on quality of service, parts availability, delivery, politeness and the speed with which they deal with every AA enquiry.
Tunbridge Wells branch manager, Alan Webster, said: "It's quite a feat to win an award like this because it's judged on a national scale, so I'm extremely happy.
"We have about 140 AA patrols on our books and we're very proud to be recognised as such a vital link in its service chain and to the success of the contract that LSUK has with the AA. We strive to give a good service at Tunbridge Wells and it's a good feeling to know that has been identified."
The AA's road operations director, Steve Dewey, will present the Tunbridge Wells team with a winners' shield next month, and the regional winners in the awards - Trafford Park, Glasgow, Gloucester and Brighton - will all receive a certificate of recognition.
LSUK's AA account director, Steve Cambridge, said: "Having awards like this is an excellent way for us to keep tabs on the service that we're providing on a national scale. By talking to the AA patrols directly, we get a clear picture of what we're doing well and what we could improve on. That process of review is beneficial to everyone and means we can continue to supply a service that is second to none."