Generally no need to use treated timbers on interior framing work. Standard CLS (as opposed to the slightly stiffer structural C16 grade) is more than sufficient for stud walling providing it isn't a structural (load bearing) stud wall. Timber yards are generally a far better bet than DIY sheds in terms of both quality and price in my experience. In other words you are spending more than you need to
They only have cls in 2400 and I need 2450. For 50mm difference I have to pay 3 time for treated timber which especially during covid 19 is a piece of s...t
If you're desperate to get the job done & can't get to a proper timber merchant then just double up head and/or sole plate so the stud length drops to less than 2400
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