This has been posted before at £49.99 but now it is £39.99. They had one made up and on display in swansea Morfa and it seemed sturdy enough.
Sure its probably not the best wood but at this price does it really matter? Perhaps you could even get a tub of this to go with ithttp://www.hotukdeals.com/deals/wilko-5-litre-fencecare-paint-3-00-/730796
I don't know, can you use fence paint on a bench? I don't see why not.
It's OOS for home delivery but checked a few stores and seems to be a fair bit of stock about. For example at the time of posting available in.
Swansea Pontardulais Road
Cardiff Newport road
Swansea Morfa Park
Swansea High Street