As I said above you don't have to be evicted to qualify for social housing.
(Being evicted will actually harm your chances).
Like a lot of things about the welfare system that "everybody knows", it's a myth, it's based on media misinformation, gossip, and pub-wisdom.
(The current crop of baliff/sherriff crap on TV are often a prime example of media misinformation in this regard).
People are also confused (intentionally?) by some council welfare departments saying they will not help you until you are thrown out by the bailiffs.
That's the welfare department policy on helping you, it's nothing to do with your position on the social housing register itself.
Being 'unintentionally homeless' (not your fault that you became homeless, eg. S21 notice to quit) will only give you a higher priority for social housing if other factors also apply.
Most unitentional homelessness is 'non-priority' and qualifies as 'medium need'.
Being evicted, (for reasons other than a S21, eg. rent arrears), will actually give you the lowest priority for social housing.
(Lower even than if your are currently a private tenant with no arrears or other problems).
From my council housing website, which has A (high) to E (reduced priority) banding.
http://www.cumbriachoice.org.uk/Data/ASPPages/1/32.aspxBand E - Reduced Priority
Households will have a reduced priority when:
- Rent arrears or other hosuing related debt
- Breach of tenancy conditions
- ....(continues with other reasons).
Again like I said above, check your own councils social housing policy you will find it is similar.