House numbering in the UK was introduced to help the postal system, and houses were numbered in ascending order from the location of the town or village post office, (thus not necessarily from actual town centres).
As towns and villages have grown and merged, this has created the situation where you might find the house numbers in a street suddenly change out of sequence. Increasing numbers may suddenly start to decrease. Odd and even numbers change from one side of the street to the other. That's because the houses were originally numbered from two different post offices, but with urban expansion the two separate sets of numbers now meet.
At least we're more fortunate than those in some parts of the world, were a letter might be addressed to someone 'at the house above the shop of Hassan, the one-armed tailor'!