"The actual cost of changing to blue is unreported but likely to be a few tens of thousands depending on the approval process."
Like all Government promises - whatever they claim now, it is bound to be significantly more when the time comes - when has this ever not been the case?
It's a little like the fact thnat no impact surveys have been carried out on the effect of Brexit - as Stephen Fry is fond of saying - "nobody knows"
All we do know for certain is who will bear the burden - go see who benefits and who loses over in the US with the new tax awards