Hi Nuttish,
I know this good shop in France
I buy my Campbell's Satin Laid Linen Thread in this shop http://www.marchand-medieval.com/medieval/lang-en/129-Strong-linen-thread
They are serious, fast and they work with Campbell's house
They have many colors and all numbers from 132 to 832 on request
They have Campbell's & Barbour waxed linen thread too http://www.marchand-medieval.com/medieval/lang-en/55-Waxed-linen-thread