I have found that sliding doors have been a bit overtaken by the 'pocket door' idea. Now unless you're building a stud wall from new, or have lots of space to spare, a pocket door is a weary thing to install. It fits into a cavity between the two outer leaves of a stud wall. Not ideal for solid walls as you have to make a false wall on the outside of the existing wall. And I've not seen any good explanation of how you get the dust and dead beetles out of this cavity that are bound to accumulate over years of use.
One or two companies do traditional sliding door hanging kits, but they seem much more common in the states than here.
Another solution you might consider is a bifold door. I have fitted one on my downstairs bathroom - you have to fettle the door perimeters with some draught seal strip as they are designed for cupboards, but as a space saving door, using the existing door frame, it works well.