Looking on the internet deeply has found these results:

There were fewer people in the shop today is the most popular phrase on the web.

The boy tThere were less people in the shop today 10 results on the web	There were fewer people in the shop today 113 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�... Dec 24, 2014 ... There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count�... There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�... There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�...

The boy tThere were less people in the shop today

10 results on the web

There were fewer people in the shop today

113 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�...
Dec 24, 2014 ... There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count�...
There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�...
There were fewer people in the shop today. There were less people in the shop today. Both are right. Many people frown on less with count nouns, but there's�...