You do have another option if you are the original purchaser. Make a Genius Bar appointment and use the UK Sale of Goods Act to demand they fix it for free but that would probably be with yet another flawed logic board swap!
Another reason I'm holding back for now is I'm awaiting the Apple Store in Edinburgh to open so it isn't a waste of a day when the Genius to point to the door.
I'm planning to buy a new laptop this year and sell my current one. This glitch makes that difficult, but on the off chance Apple swaps it for a newer model (or refurb of a 2012/2013) then I wouldn't complain!