Owing to the relatively delicate and finished nature of the model, I could hardly put it in a vice, but had to handhold it. Luckily it was possible to rest the model on its stern and this provided a reasonably stable anchor point.
I made a nick in the bow with a pair of GW clippers and then attacked the model with a fretsaw. The hull is partially hollow, but there's a lot of thick plastic to get through.
A finished model now sitting flat. The 'snowflake' debris needs brushing off. Earlier today it was snowing outside too.