How Many Pubs a Week?

I was recently asked to sign a letter to a Lord asking to support a bill which would help to protect pubs when it comes to planning permission. In the letter, it stated that there were approximately 44,000 pubs in the United Kingdom which served real ale, and that they were closing at a rate of around 21 pubs a week. This figure seems a little lower than in previous years, so I googled the phrase and I found out that about a year ago it was around 29 pubs a week. But the figures also suggested that there were more than 50,000 pubs. So if you do the maths we’ve lost around 6,000 pubs in the previous year. To create a weekly figure, you need to divide this by the number of weeks in a year, which is actually 115 pubs in a week. So how is this data compiled?  And why have I been supplied with the wrong figures; and what are the correct figures? It just doesn’t add up.