2 mornings last week I had the amber Park brake light come on. Could not release the park brake. Switched engine off for minute and tried again and It was fine. Any thorts? Thanks

You don't say what model/year but.....The only thought that I had is that as yellow is a warning, get the codes checked (if you have something like the IID BT Tool no problems), could even be the battery, but may be needing "adjustment"
At least you can use your vehicle at the moment, just don't leave it parked in neutral.  John

RRS MY12 SDV6 HSE. Sumatra Black/Ebony & Walnut + Dynamic Pack, + Cold Climate Pack + Memory Pack, Digital TV/DVD, Premium Leather, Cornering Lights, Cooler/Fridge Box, & most Options.

May need the shoes adjusting or replacing. Might be a brake switch issue. Did it refuse to release when you tried to drive away or did you use the park brake switch to disengage (with foot on brake pedal)? 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Yes it would not let me move out of park. Until I switched engine off and back on again.