My son's car is being repaired by a main dealer but his hire car is only third party insured - should the garage pay for fully comp?

My son took his Dacia Duster in for its first service and was given a loan car. There was a fault on his car and a replacement part is needed but it is not known when this will be available in the UK....

My car is at the dealer needing repairs but there's no date as to when this might happen - what can I do?

My 2016 Vauxhall Astra has been at the dealership now for nearly a month. It apparently needs a completely new engine and it's under warranty. The Vauxhall dealership say they cannot give me any timescale...