Even their surnames, McAllister and Ryan, were kept from everyone involved in their big day.

But Glasgow-born art and design graduate Colin admitted he has no idea why it took them so long.

He said: “For some reason, we have never got round to making it legal. It’s probably because we have been so busy – we just haven’t had a day off in years.”

They quaffed champagne at a top restaurant in posh Sloane Square before tucking into a wedding lunch at one of London’s top eateries then heading for their dream honeymoon together.

The pair, who met as teenagers in a Glasgow gay club in 1986 and live together in the city’s West End, admit they hope to adopt children. But Justin fears it may never happen.

The 41-year-old, from Fort William, said: “We’d love children – but the child is the most important person in the family so we want to make sure everything would be perfect for them.

We are aware that a child in a two-dad relationship will come under scrutiny.”

He added: “At 35 in a heterosexual relationship you are too old to adopt. Add the gay quotient to that ... and who knows?”

Instead, the pair will concentrate on their broadcast careers after a string of hit shows on the small screen.

To read the full interview see this week’s OK! magazine, on sale now. Colin & Justin’s Home Heist is on UKTV Style weekdays at 8.00pm.