A lot of brits opt for hog roasts (judging on a conversation I had with a friend the logic is it's cheaper as you give a lighter starter and just serve it with salads, breads etc rather than splashing out on a lavish four course meal)...so for them that would be their centrepiece/main dish like biryanis.
At our wedding we have pilau as the main dish for the baraat day and on the walima it was a biryani-this was done to the regions in which the events were held.
On another note...fish is another popular one at british weddings. I've been served salmon goujons with garlic mayo-loveeellllly jubbly.
As for comments about Mo, she's in a league of her own :) bless her.
I quite like smoked salmon myself....
One of my bestfriends is off to a wedding in the states...if I remember I'll ask her to note down her meal from the wedding.