In ,
typed:
I need a new corner fitting for my gutter and I'm trying to
identify what make it is.

Here are a couple of photos of it - it's grey plastic (mine is
painted black) and probably over 15 years old

http://gutter.murmansk.mm.st/#

Any gutter experts able to tell me who made it and whether it's
still made?

Thanks

It looks like Osma squarline

http://www.blanchford.co.uk/guttering.htm