Christmas pudding is rubbish without brandy sauce. Custard just doesn't taste right. I've tried cheaper version of the sauce, other than Birds, and have found there is no suitable alternative. Birds is a perfect sauce for people who are unable to eggs, because it was created specifically for Alfred Birds wife, as she was allergic.
I think it's a slightly strange logo - the birds on the left side are quite child-like and maybe something that would be seen on a kids toy. Nonetheless, it is memorable, recognisable, and I won't eat anything other than their delicious brandy sauce!