Owning your own home

Parter is about to put her flat on the market and a quick scan of the estate agent agreement has got me confused (not difficult) there is an exclusivity period of 6 weeks and then it talks of ‘multi agency’ which im not sure about

14.2 The Multiple Agency Agreement shall continue for that period of time (the ‘Multiple Agency Period’) until terminated by either the Seller or the Agent giving the other party 14 days’ notice in writing expiring on or after the Agency Period, in which case it shall terminate on the last day of the notice period.
14.3 The Seller will be liable to pay the Commission Fee to the Agent, in addition to any other costs or charges agreed if at any time unconditional contracts are exchanged with a Buyer introduced by the Agent or with whom the Agent has had negotiations about the Property during the Multiple Agency Period. However, the Seller will not be liable to pay the Commission Fee in any of these circumstances if the unconditional contracts for the sale of the Property are exchanged six months after the expiry of the Agent’s Multiple Agency Period and where the Seller has appointed another estate agent whose activities have resulted in the sale of the Property, or twenty four months after the expiry of the Agent’s Multiple Agency Period in all other circumstances.

And:

"12.2 The Commission Fee will be payable whether the introduction is a direct introduction or an indirect introduction (where the Buyer makes the purchase as a result of becoming aware the Property was for sale through the marketing of the Property by the Agent) and whether or not the Buyer makes the offer to purchase through another Agent or through another person. Another Agent is someone involved in estate agency work or someone who in the course of a business introduces a Buyer to the Property but has no further involvement."

And:

"If you have previously instructed another agent to act for you, or if in the future you instruct another agent, you may become liable to pay other agents a fee as well as any fee due to us under this Agreement. You should therefore consult the terms of business of any Agreement you have entered into with other estate agents.”

IANAL but i interpret that as having to pay the Agency a fee on the sale if you sell with another agency after the 6 week exclusivity period?

is that the norm? Agent is the go-to independent in the area not a big chain or the tosspots in Mini’s.