> You need a passport for a right to work check. I've been through this process about 3 times in the last 5 years. It isn't difficult or onerous.
A new passport costs over £100 for a paper application. That can be prohibitive for people.
> You can literally order replacements for these easily. A replacement birth cert can be got for £12.50 and takes 4 days to receive.
These are additional costs, it's also an extra £3.50 to find it (taking 15 days), and possibly another £38 to get it quickly.
So yes, these are all costs that add up to exclude people from partaking in society.
And all of this assumes your employer knows what the hell they're doing. Given the fines are painful, it's entirely possible your employer refuses valid documents "just in case" and sticks to the ones they've relied on in the past.