I'd be interested to know if there is one aswell. I used K-tec to fit my cage in the end, but it is as close to go to BTM who I would recommend. Welcome to the forum by the way, whereabouts in Reading are you? There are a few of us about, come along to the meet at the Longbridge Mill to say hello;
http://www.cliosport.net/forum/showthread.php?717501-Longbridge-Mill-Basingstoke-Monday-14th-October
Phase1sr - took me 2.5 hours in good traffic to get to Ants unit door to door, and i'm centre of Reading. About 1.5hr from A10 M25 junction on a good run.
I have ordered a full cage for my 172 but need a welder in the Berkshire/ reading area to help with the install anyone know anyone or anyone able to help me
cheers