Good question on the rear lights. They just didn't register as needing doing when we had a walk round to see what else might benefit from some attention. Not sure why. I might nip over and get them done now you've pointed them out.
Cost can vary a lot depending on how well you get it done and the complexity. Mine was an original design so needed to be measured, machine cut and so on. The paintwork was fully prepped and the Maserati badge removed from the boot so the stripe goes under it. Total job took around 6 man hours and cost £300. I'm sure you could pay a lot less but equally you could pay an awful lot more.