No UK-wide statutory limit on dogs-per-walker exists.
The number, where one applies at all, is set locally
Usually via a council's Public Spaces Protection Order covering specific land, not a general law that follows you everywhere you work.
Real examples found
One borough's Public Spaces Protection Order limits the general public to 4 dogs under one person's control, but its own professional dog-walking licence permits up to 6.
Another council states explicitly that it places no controls at all on the number of dogs one person can walk.
A commonly repeated industry figure of '4 for the public, 6 for licensed professionals' describes a pattern seen in some councils — it is not a national rule, and some areas have different numbers or none at all.
The only reliable approach is to check the specific area or park you plan to walk in, every time you expand into a new location.
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