@Lastgig
I'm doing this for close family member, into 2nd year, no pitfalls at all, you know your niece, will she be a good tenant?
We have a tenancy agreement in place, a slightly lower than market rent, i've told her to treat the place as she would her own house.
But i made it perfectly clear to her that i now wear 2 hats, one is as a close relative, the other as her landlord.
Its also a very good financial deal for me, the running costs are small, £70pa for a gas certificate and 5 year EICR at £150, i get a good tenant, a return of about 5% after taxes plus any increase in house prices and she gets a secure tenancy, i'll never evict her and a pro active LL.
On any UC, its irrelevant the relationship between LL and tenant, so long as they are not in a relationship - living in the same property, the relation takes on the responsibilities of a LL and there is a proper tenancy agreement in place.