[quote lris]@GoLightlyontheEarth, it's basically food combining.
You choose a red day or a green day. On red days, it's unlimited meat or fish, but rice, pasta and potatoes are limited.
On green days, rice, pasta and potatoes are unlimited, but you have to limit meat and fish.
Some things are free on both days. Fruit, most veg.
Healthy extras allow you milk, cheese, nuts, certain breakfast cereals, wholemeal bread, olive oil and the like, but you have to weigh and measure.
Everything else, processed foods, cakes, pastries, crisps, chips, takeaways, chocolate, sweets etc has a syn value. Syns are limited to an agreed number each week.
The best way to get a handle on it would be to join the 'Old School Red and Green' Facebook group. There you can access the books that are issued in group, which explain the system an give an extensive list of free foods, healthy extras and syn values.
One word of warning, if you join SW these days, they promote Extra Easy (EE), which is a hybrid of the old method. As an old timer, I prefer the red and green days, hence this thread. This is a chat thread for those who have lost weight on red and green in the past.
I hope that wasn't to confusing! 
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Thanks that’s so helpful. You’ve made it so clear. Are carbs unlimited when you are on the right day then? I would never lose weight on that regime.