My M66 box has always screamed a bit in 2nd gear (from 24000 miles) I treat it as 'characteristic' it certainly hasn't got worse in the 80,000 miles I've put on it. The box is also famously stiff when cold but nice and 'snickety' when hot).
I drive it very hard but have changed the gearbox oil 3 times (currently running Fuuchs Titan Sintofluid).
I think your issue is the clutch release bearing.
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2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
2018 Infiniti Q30 1.6T Business Executive (what's this button do?)
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