That's my thoughts exactly! Let them chase him in the Philippines!
If I do that though, any come back on me as the registered keeper?
This page sums up the various options :
http://www.parkingcowboys.co.uk/keeper-liability/Basically, if you nominate the driver then that discharges any liability on the keeper. The Parking Scammers should then start chasing the person you nominate. I don't know, but I wouldn't be surprised if the scammers are very used to people nominating foreign drivers in an attempt to avoid parking charges. If they simply dropped all such cases then by now everyone would just be naming someone abroad in order to get off.
This is civil law, not criminal, so the burden of proof is "on the balance of probability" not "beyond reasonable doubt". If the Scammers decide it's easier to persecute you rather than chase someone abroad, then my guess is that is exactly what they will do. If that happens then you'll get bombarded with threats, eventually ending with a 'summons' to court. If you don't turn up, you'll lose. If you do turn up then you'll have to convince the court that "on the balance of probability" you were not the driver.
The Scammers have 6 (Six) years to commence proceedings in court. Make sure you keep all the evidence in a safe place till that time is up.