Welcome Limey. My folks spent time across the pond at Mildenhall base in the mid-60s, I wasn't around yet. Your 64 should have a 230, top gear is 1:1, rear ratio standard was 3.73, w/3.07 & 4.10 optional. Hard to describe the diff between 235 & 230, but a 235 is more bulky looking & usually has a draft tube. Brian
