No problems Stew,
The regs are a mainly there to make homebuilds and hybrids comply.
If your disco is standard the battery is secure the fuel tank is as it should be and have seat belts fitted then you have it sussed I would suggest buying a msa spill kit about £8 from ebay and a Foam fire extinguisher min 2Kgs to be mounted securly within reach of the driver while belted. When I say this, a bungee or 2 that is secure and holds the extinguisher securly is fine it does not need to be perm fixture because a big extinguisher can get in the way alot when not competing.
If you need any help reg regs just shout the wording can sometimes make it more difficult than it is. Next event is over Olney way, well Weston Underwood so not a million miles away I *think* they said Jan 20th. Today twas mighty cold!!!
Just fitted a down pipe to my little 80 actually fits mighty well. I need to get the other side done and make it into a nice Y and then single silencer and an exit.