Our new town post office opened today…

Guernsey Posts time in Guernsey has been one of moving around town.
On 1 October 1969 Guernsey Post took over from the GPO in Guernsey but the town post office stayed in the same building in Smith Street. Some years later it moved across the road.
Its next move was to 7 Commercial Arcade. This was some years ago and then yet another move was I to the Coop in Market Street. A year ago it moved into the building on the seafront where the Visitors Information Centre used to be and today it has returned to 7 Commercial Arcade. Definitely a case of ‘find the post office’ or ‘ what goes around comes around’.
Since I’ve already given the origin of that saying today you have ‘fits the bill’ as suggested by 60 plus10 https://www.blipfoto.com/60plus10

The idiom "fits the bill" likely originates from the world of 19th-century American theatre Specifically, it refers to the theatrical "bill," which was a poster or program listing the acts in a show. The phrase "fill the bill" or "fit the bill" meant that the acts, or the combination of acts, were sufficient to make up a complete and satisfactory show. 

Here's a more detailed explanation:
Theatrical Context:
In the 19th century, theatrical productions often included a variety of acts, and the "bill" was the poster or program that advertised these acts.

"Filling" or "Fitting" the Bill:
If a show was missing acts or needed more entertainment to satisfy the audience, performers or acts were sought to "fill the bill" or "fit the bill," meaning they would complete the programme.
Evolution of Meaning:

Over time, the phrase moved beyond its literal theatrical meaning to describe anything that meets a specific need or requirement. While "fill the bill" is the original form, "fit the bill" has become more common in modern usage. 

"Foot the bill":
It's important not to confuse "fit the bill" with "foot the bill." While both involve the word "bill," "foot the bill" means to pay for something. 

fit the bill / fill the bill | Common Errors in English Usage and More - Paul Brians22 May 2016 —