As an electrician of at that time some 30 years, (now over 50 years) I did some lighting in a commercial premises, I used low bay lights, and lighting track and very pleased with the result, after having a lighting consultant recommend the system.
Now I was on a role, so used same idea with another building, but the ceiling was only 10 foot, first building was 20+ foot, and compared with the fluorescent it was a failure.
Lighting is not easy, on a shop fit was told no more than 18 inches between a light, and the result was 5 x 7 kW air conditioning units on the roof. OK this was before LED, however a "beauty salon" relies on the lighting showing off the product.
Colour temperature, and even colour may need selecting, I remember in the late 60's early 70's when going to dance halls, having to test results of my dress in ultra-violet light, so I would know what it looked like, and have known girls find out their cloths were see through on arrival, I had one false tooth which glowed.
At 70 plus no idea what dance halls today have, but likely the lighting will need to be adjustable so clients know what it will look like under different lighting conditions.
Even my own house the cabinet lighting can change both colour temperature and colour, and output, and although in the main set at a very low output, I can turn it up to over 60 watt of LED lighting, so the lighting is rather an important part of any "beauty salon".
The surewire 7 way is just a 16 amp maintenance free junction box, with two zones, it is the same as any other junction box. I would think likely all you do is turn lights on/off at the wall, and control is likely through some app?

these apps frighten me, far too easy to make an error, and not be able to group the lights wanted together.
As to
it will be inspected by a qualified sparky
why, if you know what your doing, you can sign any installation or minor works certificate, all you need to satisfy is the insurance, there is no Part P involved, so as long as you have the required insurance you can do the work.
If not covered by insurance then you are either very poor, very rich, or stupid. OK one always hopes nothing goes wrong, but accidents happen, and the first thing HSE wants to see is the paperwork, and they are very good at working out when the wrong person has signed.
The Emma Shaw case was an eye opener to many, we have all use electricians mates to do what we consider as the easy bit, in this case, plug in the meter, and write down the readings, I am sure the foreman did not expect the electricians mate to fudge up some results.
The actual fault was caused by the plasterer and plumber, not the electrician or mate, but the mate instead of writing down what the meter said, realised it was wrong, and fudged the results. The HSE are not daft, and soon worked out some one had lied.
The court case was a surprise, the electricians mate was considered as not having the skill, so foreman was blamed for death.
But second guessing what a court will decide is near impossible. It seems they look for the person who was cutting corners, had the electricians mate claimed he was an electrician he would have likely been found guilty.
I know there have been some jobs where I have not done what I should have done, be it because the boss would not let me return to correct a temporary fix, or I got another job before I could return, I consider jobs back some 20 to 30 years ago, and still wonder if they could come back to bit me.
Many jobs I did like building of the Schiehallion have been since scrapped so any errors are long gone, but although one hopes any errors are found with an EICR which longest time between is 10 years, I still wonder if any jobs did have errors?