When I got home I had a very small package waiting for me, and I am so pleased that I found this available in the UK from a vendor on Amazon.
I had never heard about this particular tool before - I have a single tracing wheel which I use to mark my fabrics, but this tool was highlighted by Pam Howard in her Craftsy class on the "Classic Tailored Shirt" and I thought it would be the ideal companion to my Burda magazines when adding in my seam allowances, because the patterns you trace off don't include them.
If you haven't already realised, and I am sure you have, the two wheels are adjustable, and you can move them into the appropriate hole that represents the seam allowance you want to add. This allows you to follow the outline of the pattern with one wheel while the 2nd wheel follows alongside, but 5/8" or whatever seam allowance you want away from the first.
I'll let you know how I get on with it when I trace off my next pattern.
Thats all from me, and I'll catch you later........