The JEC have a track day at Mallory this year, never been to Mallory myself so have booked it along with Castle Combe.
With the JEC track days there are limited spaces, so you never end up with loads of cars on track at the same time all buzzing around you like flies. I find there is also normally a good split split of novice (like myself) and more experienced drivers. Best of all there is Free ARDS instructors available along with a number of drivers from the Jaguar race series who not only will go out with you and offer instruction and pointers, but many also offer fast passenger laps in their own race cars. The mix of classic and modern cars on track is nice, love seeing an E-Type flying past with an enthusiastic owner driving it like it was intended to be!
If you don't want to take you car on track you can just go and spectate and join in the mini meet up. They are great events, everyone is really friendly and helpful, I'm looking forward to getting out and doing some driving again this year.
Mallory Park Circuit - 6th April
Harewood Hill Climb - 26th June
Anglesey Circuit - 6th September
Castle Combe Circuit - 4th October
https://jec.org.uk/events/tracksport
You don't need to be a member of the JEC to book, anyone with a Jag they welcome, but the saving if you are a member almost pays for the membership fee.
Insurance wise, they don't offer just track day insurance by itself, but Lockton's offer a JEC policy which has lots of additional benefits, including track day cover when attending Club Track days. Their policies won't suit everyone, but for me the ability to be able to drive other vehicles not owned by me, have other people able to drive my cars and the track day cover make the policy I have with them worth while. I also have a couple of non Jags that I insure with Admiral purely on price, so really is a case of what you need from a policy. https://www.locktonperformance.com/insurance-services/specialist-jaguar-insurance.html