How would you permanently attach a small shower screen to this bath surround?

[Chud]

Only thing I can suggest aside from a proper shower screen (which I'd recommend) is trying to source either a glass corner shelf of sufficient size or the top from a glass table top or TV stand etc - you need to check the the glass is tempered/toughened (it'll be kitemarked)[edit- both shelves and table tops etc should also be toughened/tempered but it's always worth double checking!].

As for fixing in place...well they use silicone to build aquariums but getting it neat takes a bit of practice.

 

[Chud]

dangerous- um, why? The correct glass for the job, properly cut and edged by a professional glass supplier, properly fitted won't be 'dangerous', just not commercially sized.

It has to be tempered to be safe - that's not something that your local glass supplier can do generally - it's only undertaken generally for larger runs of products.

 

[chappers]

Most glass suppliers will be able to send any piece of glass to be toughned

 

[Tigercubrider]

Look up glass splashbacks
They can be made to size, then tempered.