I'm pretty sure that whoever signed the contract did not know about SLAs, yet I bet we pay twice as much as we need to for the top level service we will never see.
I feel a TB moment coming on. It's a good thing I'm not a mod 
I know your company has about 3 suppliers for such kit, with a fair amout of overlapping between them, my old firm amount them. Agreed, piss poor neogotiations from the customer's side. I suspect there is a fair amount of corruption, probably not with Titish Brelecom, as the customer is not buying with their money, and everyone knows that...
Although there lots of other issues with many other aspexts of the site in question caused by other 3rd parties, this is purely to do with your old firm and them alone. I would have thought that spare pbx boards would be a run of the mill thing, not a several day turnaround?
If it Titish Brelecom, does it have a Totalcare contract on it? Given that it took days, I guess not. Its possible your firm doesn't class that installation as important enough.
Don't know what you have their, but if its, for eg, Meridian Option 11, its not cost effective to carry all the spares on the van - not that it would fit. BCM should be easier. Although, if Option 11, I would have thought it would have been remotely diagnosed via RACE.
A further problem, again don't know if it applies, but its not uncommon for only certain 'engineers' to have clearance for the site.
I don't know the specifics of your recent issue, or the site, although I have controlled the 'engineers' in Thameswey before, including your area, but that was 20yrs ago, but I doubt much has relly changed on either side

. Just giving you the viewpoint from the 'other' side. Esp if you aren't Totalcare covered
