Help needed with identifying and sourcing a bottom bracket threaded shell

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DCLane

Found in the Yorkshire hills ...
Earlier this month I picked up a Carrera magnesium frameset, made by Merida. It's all cleaned up BUT there's a problem:

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Basically the drive side has a threaded bottom bracket shell / insert, into which a standard BSA 68mm bottom bracket can go. Great ... and it looks like this:

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But ... the non-drive side Shimano part has fused with the threaded shell / insert and I can't get them separated. I don't want to remove the other side, then work out what I have, as a magnesium frame is fragile. The Shimano insert has little on it except the usual BC1.37 68 AK and I'm guessing it's from an Octalink bottom bracket.

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Does anyone know where I can source a threaded shell / insert to go in the non-drive side please?
 
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