Budd Shirtmakers as featured below in Monsieur's guide to shopping in the West End.
From the article:
FOR A TRADITIONAL ENGLISH SHIRT
Budd, the temple of the traditional British shirt, established since
1910. There you will find products of exceptional quality, all the while
experiencing a true journey through time.
Each shirt, whether made to measure or ready-to-wear, is crafted in the
traditional way in the company's workshop in Andover, in the south-
west of London, by a single artisan.
Details and finishes reflect the great attention paid to the quality of the products: Egyptian cotton (more durable and precise than double-needle stitching), made with a detachable collar (which can thus be replaced), buttons made of Australian "mother of pearl",the crème de la crème...
For the "bespoke" shirts, the fabric is cut in the workshop located on the floor of the boutique, before being sent to Andover.