Voted for Labour just in that constituency, or anywhere? Because blasphemy laws are certainly not Labour policy!
When the blasphemy laws were abolished in England and Wales in 2008 (yes, 2008!) Labour whipped its MPs to vote for abolition. All LibDem MPs also voted for abolition. 59 MPs voted against abolition, presumably the DUP and some Tories. Edward Leigh, who is still a Tory MP, complained that abolition would make people think that it was all right to make fun of Christianity. Christian Right organizations like Christian Voice fulminated against abolition.
Mary Whitehouse made serious attempts to invoke blasphemy laws in the 1980s.
By the way, if you want to know when blasphemy laws were abolished in the rest of the UK:
Scotland: This year.
Northern Ireland: Not yet!
I strongly oppose blasphemy laws, and the pandering to ANY religious group; and think that Tahir Ali deserves to be laughed out of court on this issue. But it annoys me that some people seem only to care when it's a religion that is mainly followed by people of recent immigrant origin, and don't seem bothered that, for example, an MP who strongly opposed the abolition of blasphemy laws in England and Wales is now Father of the House, and that a part of the UK, that was nearly torn apart by sectarianism until one generation ago, still has blasphemy laws.