Are you asking if you are personally liable?
How much is owed?
I'm not sure what your question is in that case?
Then you would be personally liable. They could pursue you personally as the guarantor.
They could seek a CCJ. It depends how much is owed. If there is three years worth of rent then they probably would although they are under a duty to mitigate their loss by seeking a replacement so wouldn't get the full amount due under the contract.
They could pursue your house.
It depends on the sum of the judgment and what arrangements you make to pay.
If it is more than £5k then probably they would seek a charge against your house.
They are not going to get an order for sale unless you bury your head in the sand and take no action at all to resolve this.
Can I clarify anything for you?
I'm just travelling so will be off for about an hour but should be back later.
All the best.