This is why its best to drive up to nearest tube station outside the congestion zone, park for minimal fee and not get caught by the CG police, because the b@stards will get you everytime.
Take it from someone who knows :thumbsup:
Probably your best option by far, be warned as they have the new reg plate recognition system, which is rife in London hospital car parks now.
Slightest error on putting info in and theres no leeway.
Take this advice from a mates experience :D