I'm afraid I have to hold my hands up and admit to that being mine.
I was a bit worried about this one when I brewed it as I didn't get the mash efficiency I wanted. However, I tasted it after fermentation and thought it had a really good flavour so popped it into a pressure barrel and added the priming sugar. When it came to posting a bottle of secret santa beer out, I poured a glass from the keg and it looked great - fantastic head and really surprised me at how much it had been rescued. I was so pleased with it, I scrapped the idea of sending an alternative beer and plumped for the stout, drawing a few bottles from the keg. I popped one in the post to you and took a few others to a friends house where the bottles were, sadly, as flat as you have seen and generally just a bit thin. Tested from the keg and it was pouring flat too. So no idea how the first pint or two from the keg were so good and then the rest so awful.
I still think the flavour is there, it's just not up to scratch on the carbonation/mouthfeel, so I've resolved to do two things:
1) Send you a different bottle of beer (something bottle conditioned and acting a bit more consistently!) as I really do think what I sent you was a massive let down. Will try and get in the post tomorrow if I can.
2) Buy some cornies