Anyone know what the common ready-made curtain sizes are in the UK?

Window size is 234 x 120 cm drop

I think 138 cm (56 inch) drop is a standard size.

Window width is about 96 inch, so I reckon two pre-made curtains of 60
inch width = 120 inchs would be OK.

So I would need a pair of 60 inch x 56 inch drop pre-made curtains. Is
this a common size?

Thanks
Bruce