Thanks Richard.
Fetta is a great cheese to make as it can be eaten almost straight away, and it can be kept in the brine for weeks/months.
I made my brine to roughly 12.5 % strength, mixing 150g salt with 1 litre boiled, hot water. I make it the day before so it has time to cool in the fridge.
A number of people on the forum have posted problems with their fetta going soft. I have not had that problem, but I do add a teaspoon of vinegar to the brine as recommnded by most posters.
You will see lots of posts regarding brine strength:lots of posters dislike the salty tastte from brines over 10% strength. However, you need a stronger brine if you plan to keep your cheese for any length of time. Personally, I don't have an issue with the salty taste, and it can be washed/soaked off with milk anyway.
Good luck, and dont hesitate to ask any questions you might have.