On EICR prior to a CU change I found about 12 downlights with basic insulation exposed, some connections in connector strip and some connector strip covered in insulation tape.
Napit code breakers recommends a C2 in this situation.
Best practice guide 4 says providing they are not easily accessible or likely to come in to contact with metal work code C3 is recommended.
In my mind best practice guide 4 is probably the more sensible approach.
Something that I come across regularly
My planned approach going forward with exposed basic insulation will probably be:-
In enclosed roof/floor space between building floors C3
In loft space with easy access C2
Connector strip covered in insulation tape C3
Not sure how I feel about just covering exposed connector strip with tape.
If I have to actually re-make the joints labour costs as much as the lights, so replacing probably makes sense and gives a good result providing hole size doesn't exceed say 85mm.
But if the existing holes exceed 100mm I end up using something like a 135mm concealer ring 
which is a great technical solution, but in my opinion doesn't look great.
I think it's a reasonable solution if the customer has no plans to make other changes in the next few years.
My current customers plan to renew their kitching in the next year, I am sure they won't live with a compromise solution for the new kitchen. which means whatever I ask them to pay for replacing the lights or remedial work will effectively be throw away money.
I am sure if I ask NAPIT support line 3 times I will get 3 different answers, all eventually coming down to the statement, use your engineering judgement. This email is an attempt to get opinions to help form that judgement.
