Oh dear - I can't really say I'm 'reading' this book because all I've read is the short sample sent to my Kindle, but I don't think I can continue with it.
Even just in the first few scenes, the following happens:
A non-EU (Russian) citizen is applying for ILR to stay in the country via the 10-year long residence route, except that apparently her work visa AND her passport were taken away from her 9 months ago. But it's okay, because she's somehow still been allowed to stay in the UK and is now volunteering in an Oxfam shop 3 days a week... which is fine because apparently it doesn't violate the terms of the visa she doesn't have because they aren't paying her.
Her ILR application contains a letter saying that she needs to be granted ILR because of her personality - because she knows all the moves to Steps songs, because Prince Harry would want to marry her if he ever met her and you can't deny a future princess, because she's an integral part of the local pub quiz team etc.
Oh, and the guy working at the Home Office who is reviewing her ILR application (but for some reason is just an office guy, not an immigration officer and can't make a decision on the visa anyway) apparently doesn't know his own agency's immigration rules because he talks about how most of the visa applications he gets (which apparently only arrive on Monday mornings) are from EU citizens wanting to apply for student and work visas to stay in the UK.
The ILR is refused of course, but not because she's an illegal overstayer and working illegally in the UK... it's refused because she has spent more than 450 days outside the UK in the last 10 years (which isn't even correct because the allowance is 540 days in 10 years for Long Residence ILR) and then the refusal letter gives her 3 months in which to leave the UK (don't know how she can leave though, since apparently they took away her passport)!
It's like the author has sort of done a bit of research into visas and terminology so it sounds good, but actually has no idea how the system really works

.