I know the reputation Britpart have but I bought a complete hose kit from them and not had any problems can't remember price but you can check on there website
I use mine every day and it no worse than any other car I've had and in forty + years of driving I've had a few , British and foreign , if your not happy with it sell it on let someone else play with it !
Or there's always the range rover register , they have regional organisers for meets . They have a website you can look at that'll give you an idea of what they do .
Both sides dip on mine but I have found if you go from rev to drive without a pause they won't always return properly.I leave it in neutral till there fully returned .