Thanks for your replies. John my serial numbers are 
Standard 80   804072KD
Standard 77   269801KD
Standard 88 Diesel  DSL827385C88G
As for casting of part numbers in the wheels the only info is Oliver 77 or Oliver 88 as appropriate. The 80 has spiders (as we call them) holding the pressed steel rim on. The spokes in the spoked type of wheel we have over here are all round material approx 5/8" or 16mm diameter.
The 77 is fitted with circular steel bolton weights either side of rim.
I can send pics of each if you would like to see same.
regards CWB