Sorry to dig this up again, gear wrench are a brand I have use of at work, really excellent ratchet spanners. They have a flex end with the ratchet which I find is excellent, theres a decent amount of teeth so less rotation to get to the next tooth in the ratchet. The ones at work are standard length metric but gear wrench I think are an american brand so imperial would be a big part of their business. Munster tools sell them and as far as I know they have a lifetime warranty.

As above the rep for a tool company is probably your best bet, lots of stuff isn't listed on the net but is lying around in the back of toolboxes in vans all over the country ready to be sold, I'm always amazed to see the range of tools carried in the back of a tool man's van!