Your a land lord , obviously earning money from rent get a new board with RCBOs throughout
Why? As long as its in good condition then its a perfectly serviceable board and if the lack of RCD protection to the lighting cirucits is an issue then a couple of Wylex Miniture RCBOs will fit that board and can be fitted within half an hour.
Its alright saying hes a landlord, hes earning plenty of money (which may not be true) but costs on Landlords obviously trickle down into rent costs over time, plus if they end up with lots of people doing unnecessary work, then I'll only lead to wider distrust of the electrical industry and stuff that does need doing may be neglected and they might try and avoid doing the required 5 yearly EICRs.
You only have to look at my recent thread in the pictures forum to see a rental property that is full of C2s with at least one C1 that actually does need urgent works doing.
I recently issued a satisfactory EICR on a property with much the same board as that pictured. Lack of RCD protection to concealed cables/lighting/bathroom lighting (bonding was installed as per 16th ed) went down as a C3. I commented on, but didnt code the lack of surge protection and the type AC RCD. And after doing some repairs while I was on site* I concluded it was now no more unsafe than it was in 2001 when it was wired to the 16th Edition
*new bathroom light - [Old one had come away from ceiling and was an old 2D 16w that was a litttle cooked inside, wasnt worth refixing it], pendnat loose on ceiling, socket box loose in wall, burnt socket from a bad plug on a heater, metal switch needing earthing, upstairs ring broken due to two burnt out loose connections in sockets, pendant had been changed and had ended up with the neutral being switched, cooker connection unit smashed)
Admittedly there were slightly more issues than I first thought when commiting myself to doing them as I went, but I was already part way through and commited to it, and I'd promised the tennant I'd sort the bathroom light (it had come away when they tried to change the lamp so they had no light in bathroom) and refix the pendnat in her son's room.
The landlord (or management company) will have been billed for a day and about £50 of materials and for that they got an EICR on a property ~1hour from base along with all the minor repairs it needed to get it satisfactory, as well as some bits like the bathroom light and the loose pendant sorted that the tennant would have ended up putting a repair request in for if the wasn't for the fact that I did them while on site. I'm not saying thats always what needs to be done (and some clients may inist that you don't do the issues on site) but rather keep rationality in mind and try and offer good value for money to the client rather than just thinking "well they can afford it"