The only thing was to highlight that their arrival time is in their contractual agreement.
I think we were right not to deduct anything from Olly, or Alexandra; because nothing's been agreed, there are no grounds for us to do so.
However, it may be worth imposing a cumulative late fee: for instance £10 per half hour late (a full half hour fee will be deducted for every 15mn late: so if you arrive [15–44mn] after your contractual arrival time: you'll have £10 deducted; if you arrive [45–1h14] you'll have £20 deducted and so on.) If this is something you wish to do, it'll need to be "advertised" in a separate email as an update to the usual terms and conditions of the contracts, with an exact date from which it will take effect.
I'll start thinking about the exact fee structure, and prepping all the new T&Cs and an email for "advertising it" to all musicians. And only putting this in place when these "I've got something else I'd rather do" latenesses occur a third time.
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