Ohhhhh! I see, that definitely makes sense. I took the advice just to see and had a 30g carb snack with 15g sugar and checked about an hour & 30 mins later and my BG was 87.
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87 is very good

I recommend doing the occasional after meal test though. That way you can spot things changing in good time

A middle of the night test is also a good random one to do, just to keep an eye on your blood sugar over 24 hours.
As you've probably noticed, people here are using different blood sugar units. This is because the UK uses a different unit from the U.S. Here's a link to a handy converter:
http://www.diabetes.co.uk/blood-sugar-converter.html