HW pipes, yes, so that they cool down less between the times you run the hot tap, so you need to waste less HW while waiting for it
CH pipes yes if they are in unheated spaces (under ground floor etc) or unoccupied areas
All pipes in lofts as they may freeze
Some people say you do not need to insulate CH pipes if they are in heated areas, since they contribute to the general heating of the house. However they can waste a lot of heat when it is not required.
Airing cupboards often have a lot of hot pipes, and these throw off a lot of wasted heat. Pipes round the boiler may make the kitchen needlessly warm.
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