I can't believe it arrive yesterday 11 months after you posted it (and I thought the UK postal service was bad). Hold on it may have been stuck in Oldham sorting office all this time.
I left some postcards at the hotel's reception to be posted since there were no post boxes in the surroundings and I had no time.
I came back to Italy and since no post card arrived, after a couple of weeks, I asked to the receptionist

and he replied that he did his job
A month passed and no post card arrived. I thought they were lost.
Maybe it's not only UK post, because also my friends and relatives in Italy got the Pilsen postcards last week.
It's italian post too
BTW I recommend a visit to the Brewery Museum in Pilsen and also Pilsen underground is very interesting
rgds. Franco