As Nigel said, that's what I'd do, however you canm take insulin "between meals" when you're running high.
I've got mine totally wrong before & found myself running high & taken an adjustment. It depends on how high I am. If I'm up to & including say 10 I'll just leave it till I next eat, but 11 or more I'll take an adjustment. Just remember that with no food to "fight" the insulin will hit your system quicker & have a greater effect on you than with taking food, that is it will bring your BG's down further than you perhaps anticipated.
If I'm in that situation I work out what Novorapid I would normally take to bring me back in line then knock it down by 1 unit. This will bring my BG's down to a more acceptable level without me going th eother way & into a hypo.