Mystery Chair - another try with photos any information please  

Hi I acquired this chair about 4 years ago because I like the shape, I thought it could be 60's but could find no makers marks or any identifying information. I took it along to the Antiques Roadshow on Thursday but they had no experts in mid-century modern design on the day but suggested trying a forum like yours and the V&A design. My first thought was it could be a piece by someone completing a design degree but it is very well made, no scimping on the frame etc. I don't know if the upholstery is original but thats how I got it, I'm about to re-cover it in a orange fabric which I think is more flattering and sympathetic to the design. Any information would be gratefully received.
Thanks