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Agreed, clause 5 doesn't really make sense being there, but it's scary ! 10% of ALL the fees over the duration of the tenancy - ouch !
I haven't asked the letting agent for 2 reasons, for one this has all happened over the weekend so haven't been able to, & secondly I don't particularly want to. There's bad feeling on their part as I didn't use them when I put it on the market, the 1st thing they'll say is "Why, as the tenants are moving out ?", then they're bound to say "Yes" & won't take any notice of the fact notice was given to the tenants weeks ago.
I've e-mailed Landlord Advice UK but their automated reply says "we will respond if a response to your email is appropriate", so I won't know if no reply means they haven't looked at my query yet or they're just not going to ! I will try ring them tomorrow.