I am writing to say how pleased we are with the garage you recently supplied to us.
How encouraging to find a company who appears to have the interest of their customers foremost. For value for money, surely the garages you supply have few equals - for quality of service and advice I would certainly have no hesitation in recommending your name.
If you have any customers who wish to see an installed garage you may refer them here.
Please accept our thanks in this unsolicited letter.