I don't think the review process is very robust and it relies on the benificiary to notify the council. Your income could double/far exceed HAP thresholds and you will keep HAP., but may have to make a larger contribution.
Meanwhile, someone that is just above the threshold for HAP, has to fully fund rent (unless another benefit can be claimed). This second person/family could well be earning less than a HAP beneficiary that qualified for HAP on low income, but is now on higher income.
One of these days the entire thing is going to crumble down. It seems to me the government is paying :
a) part of the amount borrowed to buy in a scheme of help to buy
b) paying the rent via HAP for working people
c) paying the rent via Ras
d) paying another organisation the likes of Placefinders to find landlords for tenants (with the latest being a 500 Euro sign on bonus, which clearly means either they have too much money or they are desperate for landlords to sign up, which in turn means we should stay well away)
e) paying 'Housing bodies' (charities) to buidl, then the government is
f) not taxing the large institutional landlords (REIT's) as the favoured class
g) paying the scheme to convert shops into flats
h) giving grants to bring back housing stock
i) paying councils to inspect rentals, then the council pays someone else to do the admin and the admin contract private organisations to 'inspect', whose staff wouldn't know a screw from a nail, but will insist you use a nail instead of a screw when the screw is perfectly adequate
Where did this all go wrong, the whole thing is absolutely bonkers. There are too many people taking a piece of the pie and the taxpayer is on the hook for all of it. Meanwhile we have a -
all together now: Housing Crisis