I hope they don't forget, or just cancel them if they have no stock left back in the UK, as that would be an insult... to invest so much time and money for a complete series, just to have some issues skipped, and expect to have you be okay with an incomplete jigsaw puzzle.

The least they could do is acquire copies listed on ebay, and just eat the cost, as their reputation is on the line if they don't deliver a full series to paying customers.