I haven't heard of those, but I shall make inquiries to one of the large booze stores south of town. I may have to give those two beverages a try.
I'll see y'all later - I am off to fire my Lee-Enfield!
Details of spitfire
http://www.shepherdneame.co.uk/beers/index.php?spitfire
Details of John Smiths
http://www.johnsmiths.co.uk/brands/original.htm