Peeped this over at Fixed Gear Leeds.
“just knocked this up to help anyone out who needs to find out the bcd of any obscure/unknown chainset. Should work out exactly A4 but I’ve included a scale to double check. Hope someone finds this useful!” I sure will.
To use it just enlarge the image by clicking on it with your mouse then hit print. It should then print out perfectly on a sheet of A4.
Thanks Sam, good job.