They began by looking again at the murder of Cardiff prostitue Lynette White on St Valentine's Day in 1988.

BBC: Sex shop murder case reopened

Red is the colour of love and that will be the colour of the lights radiating from the historic building on St Valentine's Day, while rainbow colours will mark Belfast Pride in July.

BBC: Rays of light over Belfast City Hall

But the St Valentine's Day vote provides a good example of how an investment decision can sometimes resemble a gamble.

BBC: Valentine test for Princess tie-up