Electronic Hand Brake issue

[Ginger Megs]

I have a 2013 Discovery 4 TDV6. Just recently the warning lights on the dash show that the parkbrake has a fault and indeed it does. My problem is that when pulling to EPB switch, the paarkbrake does NOT engage which I guess, is better than it locking on. Cheapest things first, I replaced the EPB switch with a new part but that didn’t fix the problem. The vehicle drives really well but what could be causing the parking brake to not engage?
Cheers
Ginger Megs

[V8Ian]

Simple things first, is the brake properly adjusted? How urgent is the repair, I rarely use the parking brake, admittedly mine's not electric.

[BradC]

Do you have access to a diagnostic tool? The car is actually really good at telling you what is wrong with it, you just need the tools to read the faults.