As far as I can see this company rarely takes matters to county court.
They already have done.
Whether or not they discontinue before paying the court fee remains to be seen.
They hope that your friend throws the claim form away because then they will apply for and obtain a judgement in default against your friend.
The deadline for response, either by filing an Acknowledgement of Service or a defence was 8 June.
If an AoS was filed by 8 June, the deadline for filing a defence is 22 June.
If the 8 June deadline was missed, there may already be a default judgement against the defendant. But you say above that AoS was filed.
Either file a defence or pay up! But the defence really needs needs to be specific to this case and its circumstances. Not some boilerplate generic stuff. The keeper is liable if the Protection of Freedoms Act 2012 has been correctly applied to transfer liability from the unknown driver to the registered keeper.
Without the original PCN it’s hard to conclude whether or not this process was correctly followed.
In the absence of this I would suggest you stop wasting your time and tell your friend to stop throwing important things away.