A colleague told me about this and I thought it sounded like it could be a laugh. Most people, including myself felt Amma was far too serious in the house, so doing something like this shows she does have a sense of humour.
Even for a spoof item, being asked to dance at the Brits is quite an honour and I was impressed, but I suppose it depends how it's actually presented. I'll watch tonight and make up my mind then.