Well the missing shower screen finally arrived today. Two months late, but nevertheless it's installed and looks great. Finally, TANA Aluminium delivered. The installers did a good job.
Would I recommend TANA Aluminium? Short answer, no. Their service was less than satisfactory in comparison with the rest of the build.
In the end it didn't detract from the build quality, so there's really nothing to complain about. However, for stuffing around, TANA sets a new standard, even on the stuffed-around-by-Thai's-scale that we've all experienced.
Never mind, all's well that ends well.
Next jobs to be done include building a ramp to the back door and, in lieu of guttering, putting in a ring drain / French drain around the house.
Updates will be posted as and when these are completed.