Hello again All,
I had some bookmarked pages from a website which did not show the O coil I was looking for.
However, this morning I checked on Google for "GB Stamp Rolls" which gave me the home page of that fantastic resource and for anyone who may be interested this answered my question.
The listings were shown as
O1 1920 Simple Buff £2.0.2 12
O2 1921 “ Red/White £2.0.2 12
O3 1924 Block Red/White £2.0.2 csw
O4 1924 “ Red/White £2.0.1 csw
O5 1927 “ Red/White £2 ☰ csw
O6 1929 PUC Red/White £2 ☰ csw
O7 1930* Block Red/White £2 csw
O8 1935 PG Red/White £2 csw
So - Question answered.
For anyone interested in coils/leaders this website is so brilliant.
https://www.gbstamprolls.com/Congratulations on a marvelous resource.
Cheers
Ron.