There are varieties in the size of the portrait but none seem to have extra value.Since I only have this one example I cannot tell if it is the smaller or larger portrait or possibly some other variation.
Here's the stats...
Type/Country: 20 Pence / Great Britain
Metal: 84% Copper, 16% Nickel
Value: $0.35 in VF
Do you have a coin from Great Britain and want to know its value? Leave a comment/question and I will do my best to find out the price and history for you.