It really doesn't matter. No appeal will be accepted. Only a county court claim that is defended will result in this eventually being discontinued. Their modus operandi is to escalate with threats of litigation in the hope that the defendant is low-hanging fruit on the gullible tree and will cave in once the (imagined) pressure increases.
By the time it comes to them having to pay the trial fee, if the defendant hasn't caved, they will discontinue and move on in search of even lower hanging fruit.