Generally with gradual air loss if there’s no puncture it can only be a few things. The valve, is the core tight? You say there were no bubbles when submerged, did you apply movement to the valve whilst submerged or is it an early tpms metal type? It could be removed and a standard valve added for testing. Although the tpms light would be on in the process.
Alloy wheels can become porous but generally only old ones, back in the day an inner tube would be fitted to prove or disprove but not possible now.
Bead sealing, I’m guessing when bead sealer was used the wheel was thoroughly cleaned?
Age of the tyre, the tyre itself can become porous which Is difficult to prove but if it’s dated as an old tyre I’d probably start here as If it doesn’t fix it at least the tyres are safer
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'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle
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