Vast swathes of customers haven't got a clue what an RCD does..
as for SPD's you may as well be talking a foreign language...
They think that the five-way multi-block adapter the bloke in Curry's sold them with the desktop PC or flat-screen TV did surge protection!!!
I'm not the cheapest either...
Nor do I aim to be...
But the reality is quite a few customers like to either source materials themselves, or google the price of things to compare with any quotes they get..
So they go walking around B&Q or browsing Screwfix and see all these "populated" CU's
which "must be all acceptable and compliant with regs"..
Yet the majority are just Dual RCD.. No SPD's
https://www.screwfix.com/c/electrical-lighting/domestic-consumer-units/cat7230028#category=cat7230028&csupopulatedunpopulated=populated
And the bottom line at the end of the day is if the customer doesn't want to purchase what is an "optional item"...
It is better business sense to do the work they do want..
and keep a customer,
rather than losing them to a.n.other electrician who will fit a non-SPD CU...
Since commencing self employment back in Feb 1999..
the few properties I have encountered that have had any issues with lighting surges...
Have far more to worry about than a few items of electrical equipment being zapped!
Typically cables and walls damaged.. Roof sections of roof no longer existent..
Insurance covers the remedial work and SPD's would provide negligible help in such situations..
Whereas dual RCD's cause regular headaches for fault finding..
But full RCBO's can save hours of testing and thus significant amounts of money and time..
If a potential customer asks me if I have SPD's fitted at my own home I have to honestly answer NO..
If a potential customer asks me if I have a Dual RCD arrangement at my own home I also have to honestly answer NO..
They will make of that what they will in their evaluations around what that wish to purchase..
Guinness