Thanks to everyone who posted to help. We found a really good shop at Taysaka and decided to go with rattan and not the plastic Chinese rattan. This shop was the best value for money and I haggle the price down a bit. Shop had a good stock and the guy makes all cushions himself, you just pick the material which is weather proofed. He made up the cushions and also a cover for the set and delivered the same day (yesterday).
He showed us large book which showed the furniture being made in Turkey and the rattan being woven. He also gave us a 4 year guarantee and said if there was any damage to the rattan, he would repair it, as he keeps rolls at the back of the shop.
We are really pleased with our purchase.