Work a radiator engineer can help with
Radiator fitting
Describe what is there now, what you want changed and any photos, so quotes cover the same scope.
TRV replacement
Mention the size, access and any deadlines so tradespeople can price the job accurately.
System balancing
Say what finish or standard you expect and whether materials are included.
Leak repairs
Add anything that could affect the work, such as parking, pets or working hours.