I’ve checked my sugars and fortunately they’re ok at this 7.9 . I have been busy painting so the exercise has probably helped to keep it low. Should I increase my insulin this evening to compensate or just have my usual 45 units .
What do others do if they forget
We can't tell you what you should do, but we can tell you what we would do.
With the numbers you're seeing right now, it looks like the extra exercise has done a very good job.
Levemir has a relatively short action profile of 14 to 20 hours before most has gone. With your split dose there is a nice overlap between doses, so you haven't been completely without basal.
The action profile of Levemir is the most strong some 4 to 12 hours after injecting, so taking extra now could put you at risk of nighttime hypos.
What I would do is take my next dose now, so a little bit earlier than usual and go back to normal tomorrow morning.
Are you on mealtime insulin as well as Levemir? If so, and if you are comfortable with correction doses, you could put an alarm at some time halfway through through the night to test, but if you're not on mealtime insulin or not familiar with correction doses I wouldn't bother.
Should you find you go alarmingly high at some point, or if you are uncertain on what to do, by all means call 111 for advice!