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@Scilly.Suffolk
Gear calculator here. Don't forget that the size of your tyres will affect the gearing a little.
43 isn't a common size for a chainring: 46 or 48 are more usual and therefore more readily available.
Something around 67GI is a favourite for commuting/general use. 43/18 will give you 63GI, which, as WJP says, is quite spinny. Unless you're particularly feeble or live in the Pennines you'll soon find it tiresome.
46/18 gives you 67 and then as your form improves, you can swap the rear for a 17 and then 16, to give you reasonable increases: 67 - 71 - 76.