Wages/salary question

[andyjo1982]

Evening all

If my employer has paid me a higher salary than usual, for no reason, just an error on their part, would I have to pay it back? Or are they entitled to pay me a reduced rate next month to make up the difference?

If the extra amount was specifically listed on my wage slip as a bonus, again, would I have to pay it back or are they entitled to just pay me less the difference the next month?

Cant seem to find anything on Google about this. Any official links to laws etc would be useful.

Thanks