Drove to the National Restoration Show at Stoneleigh where the Jaguar was on display on the Practical Classics stand. Had a hell of a job driving between stands to get into position.
Decided to work on the car on the stand. Replaced the broken air intake actuator in front of an audience.
Driving home I experienced the heating system with full vacuum for the first time ever. It's amazing. The actuator can be opened and closed by degrees and the variable heat control has been restored. Fantastic.