I've always been treated well by Drennan... Once ordered a pair of super specialist rods.. After having used them a few times I noticed the rings were cracked (2/3) on each rod.
Replaced no quibble.
Same with the specialist landing net... the component that can wear - was replaced free of charge and it was outside what I considered to be the warranty of 12 months.
typically Drennan is associated with quality and after care service - Don't know about replacement tips... was it an old model? Did it break through fault, defect or accident?
I snapped the tip off my favourite Daiwa trotting rod (it was rather expensive... GULP £££)... Sadly a replacement tip was out of the question - the model had been replaced with a new version - different taper. I know one of their reps really well and he did what he could... In the end had to claim on insurance - I did'nt come out too badly.