Thermal expansion as plastic is much higher than glass, glass higher than aluminum, aluminum higher than iron. Fused together seams a weak point just add heat and stress, cook it a lot and now a brittle time bomb part ready for failure at any given time.
Out in the bush, leaky leaky time, now what are you going to do, tow out 75 miles? Think of that tow bill would ya?
Dad told me to never drive farther than i'm able or willing to walk owning a LR.
Only defense we both had great expectations when the Olds /Buick 215 was introduced.
On the 87 325is BMW it has two 3 into 1 cast iron exhaust manifolds bolted to the aluminum head. Off the two manifolds one solid mounted down pipe, the other with a short section of stainless bellows allowing thermal expansion before the 2 into 1 "Y" to not be a problem. DIY types i've seen (not wanting to pay for that expensive down pipe "Y") item or a custom hack job would weld in two solid down pipes now causing cracked cast manifolds. There was a reason those "Blockheads" went the added expense of materials and labor solving a KNOWN problem. LR proves over and over again not just a one time "OOPS" we need to correct a problem which is way cheaper pre production time than during or in their case after which is post warranty ended time now on the LR owners wallet. My leather seats as example made of super thin material, splitting at the seams besides long ripped sections by the 67K mile mark. Think what would of happened if those "Beefeater's" had gone the cheap materials route on their Rolls Royce's? Must add used RR's come up rather cheap due to catching up on maintenance replacement parts alone costing more than the RR is worth used. Big bright warning signs. Still a stubborn person at this end not letting Mr. D1 get the best of me keeping it running, a DIY repair person the past 52 years with several times making modifications to parts or making parts to my liking. Ya don't tell me "it's not gonna work".
If cloth embedded silicone tubing can withstand 245*F at 26 psi on turbo Subaru's of app 3" diameter it shouldn't be a problem handling LR's coolant temps and pressures, more like a life time once installed part and forget. That above $3K crossover pipe replacement then those $5-7K timing chains SNAFU posted repair bills. No thanks, a reason owning a 95 D1.
Talent your born with, you have it or you don't, it can't be learned......~~=o&o>......