Terrain 4" round plastic gutters - where to buy spares?

WobblyDog

A relative has a house equipped with 'Terrain' 4" half-round black plastic gutters. Some of the joints are leaking and I would like to buy a few spares in case they start breaking when I try to fix the leaks. The house was built in the 1960s, so the guttering might be original.

I can't find spares for sale using Google. Are they sold any more? Alternatively, are there any other guttering ranges that are likely to be compatible?

London50

I think you will have problems getting the size, I worked during the 60's in a builders merchant selling that product but I believe that once metrication came along it changed to the new 110 mm sizing {along with copper piping ect}. Unlike the copper piping that you could buy imperial to metric adapters I do not remember anything being made for guttering or the downpipes, so unless there are any in junk yards I think you could have problems getting spares.
If anyone worked in the business after the {say} mid 70's that knows of any then I bow to their better knowledge.