Warning: digression perhaps rant.
I feel really bad for the poor bloody tenants (obviously this is in no way the OP's fault). Private renting sucks. You get settled somewhere, the landlord decides to sell, and you have to find somewhere else to live. Then it happens again. No security whatsoever.
And so many LLs are unrealistic and greedy. In the past year, we've moved 3 times. The first time our landlord decided to have the property valued but 'wasn't going to sell' 
. Unsurprisingly they quickly told us they were putting the house on the market (at a ludicrously high asking price). We were on a rolling lease, so we told them to give us one month's notice and we'd leave. We found a place and arranged to move out. Then the LL started going on about our contract having 2 months notice (it didn't, as the rent period was monthly) and wanted the extra rent. After some wrangling we 'won' but she obviously instructed her letting agent to try to get it back from the deposit, so she was a complete arsehole and we had to threaten legal action to get it back (having looked after the house extremely well, especially considering how poorly the LL had been maintaining it). Basically the LLs were annoyed that we wearing just going to stay, pay them rent, put up with viewings, and then move out the day before the new owners took possession. They were greedy (and had clearly been foolish with money) and didn't realise that by moving out we were helping them. We could just have refused to move until the forcibly evicted us, which would prevent them selling. They just couldn't accept that there would be any financial consequences to choosing to sell. (incidentally they haven't been able to sell and after 6 months started trying to rent it out again).
Second LL was moving out of the house and renting it out following a split with her partner. She seemed to have something of a property empire in the local area too. Shortly after moving in we started getting bailiff letters/visits because they owed loads of money: unpaid council tax to 3 different councils, utilities on multiple properties, thousands of pounds of unpaid corporation tax. This was not fun at all. It was also almost impossible to set up our own utilities because of this. We moved out the day our 6 month lease was up.
We picked up the keys to the current place and opened the door to find that the LL had served us with a 'sword of damocles' section 21. We were not happy, as we'd explicitly said we wanted to rent long term (and we don't wish to pay the extortionate agents fees to sign a new contract annually). We spoke to her and she said that she's had problems with tenants in the past so was advised to do this as standard. She says we can negotiate a rolling thing in writing at the of the fixed term, but we'll see how well this pans out.
Private sector renting truly sucks.
Rant over.