I am not sure that this is something that is condoned but in the past someone suggested it to me and I have found it works a treat. I am the "friend" who help Shaun-TLR sort his engine and this is what finally sorted the issue...
So firstly prime your engine and then undo the glow plug a tiny amount, literally just enough to let some fuel out. Now start the engine and the second it's firing tighten the plug back up. Opening the glow plug will release the compression a tough and reduce the resistence on the piston. I have found that this often helps me start new (tight) engines until they are properly run in.
Just getting the engine to fire for a second will generate enough heat to remove the issue with the tight piston.
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