The why and the how is usually what's missing, people say what they did but leave out everything else.
Thinking about the most common behaviours -
Making effective decisions - very often I've no idea what decision they were making so the example is completely lost, say what you were deciding.
Communicating and influencing - again no idea what the message was or who you needed to influence - but a great way to answer this one involves they "why" - why did you choose that approach etc.
Delivering at pace - very common to think it means "fast delivery" and forget it's actually about how you balanced all your work and made sure things got done at a steady pace. I want to hear about how you prioritised, reprioritised, good HEO examples involve a curveball and you saying how you reprioritised including alerting your seniors to the impact of delivery of other things.
Managing a quality service - I see less nonsense on this one but at HEO in DWP I think it needs to be an example of how you supervised a service rather than how you dealt with your own caseload.
Seeing the bigger picture - I want to know that you understand the context you're working in beyond the service you're delivering - what's the political mood music for instance and how did you reflect that in the way you ran the service. Made up eg - your team delivers PIP, govt gives disability claimants a kicking, prompts lots of phone calls from worried claimants, what did you do to prep your staff etc, why did you do this.
Working together - don't fall into "leadership"/being in charge, and instead emphasise how you made sure everyone was on a level playing field.
Leadership- be clear what you were leading and remember it's not necessarily about being in charge/being in the superior role. Easily accidentally devolves into working together.
Changing and improving - often devolves into managing a quality service, be very clear what you changed/improved and why.
Developing self and others - ignore this one unless you want to work in HR 😝