Good luck with the handbrake....but the TPS reset should have resolved your exhaust problems.

You should consider finding a device that can do the reset so you can fix this yourself in the future. They don't come around often, but when they do, jump on it.

 

There are some treads on X300 handbrake adjustment

HandBrake to hub back plate connection

There may be something in the service manual

Looking for link

 

See post # 4 as I broke the service manual into 6 parts

Look for the table of contents brake section in the first part

Repair Manual - Jaguar Forums - Jaguar Enthusiasts Forum

 

Well, Jag failed its retest on emissions again. Still high on CO and slightly low on Lambda. I'll start a new thread to investigate this one.