I cant see any legitimacy in this 5 day wait. Any migrations I have handled were at the point where there was "No Way Back", either because of throttling or caps etc, when a customer calls and says "MAC please I am determined to leave", then there is no legitimate excuse for an ISP to stall it until the last possible moment, and this would seem to be in some ways an abuse of the system, its one thing where technical issues delay the issuance of a MAC. The customer is free to use the MAC or take up any retention offer made at the point of request - BUT I would say the requirement should be for a prompt compliance with the customer request.
I wish I had known this was deliberate policy recently when I helped a friend migrate, I would have been on the case much more than I was. It is something I think OFCOM should look at and maybe issue some clarification about the 5 working day limit being an absolute time limit, not a period in which the ISP can play silly games and antagonize those wishing to exercise their right to migrate. Maybe a few calls to OFCOM to highlight what may be a deliberate abuse of the time limit?
Plusnet - added to the list of companies to avoid!
Any ISP that thinks that selling my click traffic is acceptable is MisinPHORMed
Market 1 (IPSC) - a BT group investment NOT Spot