Insulating the pipe is just a temporary fix. It doesn’t fix the initial core problem. It’s a bit like Ineos punching holes in the lower rubber door seals rather than fitting the seals properly in the first place.
I’ve managed to fix mine by simply, first thing in the morning, prop up engine bay to service position (highest point). Top up both coolant reservoirs to the max level indicator ensuring both sides are equal. Surprising how much coolant needs topping. Coolant level has gone down as air has been displaced. This should work. If it doesn’t, carry out a bleed procedure, wait until engine is stone cold (following day) and then top up coolant to max level. It has worked for me, in the summer of 2023, 2024 I used to get drips down the side the central dash onto the passenger mat, condensation on the windscreen during heavy rain and condensation (icing up) on the outside in winter (centre lower windscreen).
Luckily I have rubber mats. Been back to dealers twice and Ineos said no fix. Had the HVAC unit changed and still the same. Early 2025, seen a post on here about checking coolant as some engine had over heated and I discovered that my coolant tank was only 3/4 full on one side and nearly full on the other.
During the last month, the weather has been great for us in the UK, I can report no more drips.