Determine the value of the number ABCD

‘Aye, it’s all going like magic,’ said Jock. ‘I've got everything organized already: the flowers, the church, the cars, the reception, the rings, the minister, even ma stag night.’

Archie nodded approvingly.

‘Hell, I've even bought a kilt to be married in!’ continued Jock.

‘A kilt?’ exclaimed Archie. ‘That’s grand, you'll look pure smart in that! And what’s the tartan?”

‘Ach,’ said Jock, ‘I imagine she’ll be in white