We used the Woodfordes micro brewery system i.e. the whole kit.Purchased from the home brew shop in Worthing, they also are very helpful.
It retails between £70 and £60 which may sound pricey, but all the equipment and materials are there to make 40 pints and all of the equipment is re-usable.
The kit comes with woodfordes own wherry kit that makes a pleasant real ale, but most suppliers allow you to change the packs inside for a different one more suited to your taste.
We chose the Nog kit and to date the result is excellent and very easy.
We are going to buy another barrel to get another brew on the go at the same time.
Have seen reviews where people have added stuff for deeper flavours and more alcohol content ,but for us the kits are well worth it.