V8 Vantage Bonnet Adjustment

[Manx V8V]

Yesterday while pottering around my Vantage I noticed for the first time that the bonnet has a wider shut line on one side compared to the other, the shut lines are constant from top to bottom on both sides but it's as though the whole bonnet needs moving to the right by around 2.5 - 3mm.

Does anyone know if this is a DIY job?