Hi tiggy....I actually bought my 5 gallon Lyta tank from B.G. Hichisson, Lyta Works, Dartford in October 1981 for £89 - a lot of money then, but the quality is superb! It cost me more then the RGS bought a couple of years previously....The RGS project was a bit of a slow process due to various, not restoration reasons, and was finally completed in 1987. The RGS also has a Dow central alloy tank as seen in my intro to this super Forum. I have other Dow alloy stuff not fitted yet; Superleggera top yolk, primary chain oiler and reservoir......Good luck getting a tank!