Focus Coffee Pot (very rare) 1960's classic design

As featured in the Collecting the 1960's book (also available on this site) and valued at £80-£100 Barbara Brown a textile designer for Heals created the Focus Op Art pattern on the coffee pot for Midwinter which was manufactured by Johnson Bros. This is the Focus pattern and I have never seen this design before on a coffee pot and it is now quiet rare to find the Focus Op Art pattern.