Series 6 of Doc Martin was never released on Blu-Ray, yet it is the earliest season to have been produced in high-definition. It is available in high-definition on iTunes and streaming services, so I don't see why it couldn't be released on Blu-Ray. Well, at least not for that reason. I release that demand is the real issue here, but considering that series' 7-9 have been released on Blu-Ray and apparently must have sold well enough, why not release series 6 on Blu-Ray. Please, give us this treasure in the highest possible quality available for a home release!