WorstPigeon
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You can't wire the ones with batteries to the mains, you have to buy mains powered units. Not a whole lot more expensive, but obviously getting them to be wired into the mains is the bigger expense. The link above states they're only required for multi-unit buildings.
That's a British website. In Ireland, you must have either mains-powered alarms or at least two self-contained 10 year battery alarms (ie. sealed units which need to be entirely replaced when the battery runs out). See http://www.irishstatutebook.ie/eli/2008/si/534/made/en/print section 11
Here's an example of a sealed 10 year smoke alarm:
Multi-unit buildings do absolutely require wired alarms.