What was your actual query?
Rush Common Consent is separate from planning consent (although much of the intentions of the Rush Common Act is also included in planning policy). As far as Rush Common Consent is concerned they would look at it like this:
20. When considering applications for Rush Common Consent proposals will
be tested against the purpose of the Act, which is to keep its open
character. Generally the Council will prohibit new buildings, extensions or
structures although there maybe some exceptions where the open
character is not compromised.
Boundary Enclosures
22. The provision of all new boundary enclosures (such as walls, fences, and
other means of enclosure) requires Rush Common Consent. Proposals
should take the opportunity of opening up of Rush Common, reflect the
need to retain the open character, maintain and enhance views. In
general, solid boundaries should be a maximum of 1 metre high, a higher
means of enclosure with railings or combination of brick and railings to a
maximum height of 2 metres may be allowed. Other means of enclosure
may be allowed on areas of Rush Common so long as it would not affect
views and open character of
the Common.
It also makes reference to temporary hoardings but only really in the context of building works.
The definition of Open Character is confusing since the Rush Common Act does not preserve
access - much of Rush Common land is privately owned with privately controlled access. But the open / undeveloped character of that land is still considered important for the community.
I imagine the Ritzy setup requires permission under the act but it is not at all inconceivable that it could be granted.