A day with father and son Welsh Ambulance Service crew

Wales is the only UK nation to see an improvement in the time it takes ambulances to reach the most critical 999 calls, BBC research has found.

Health Secretary Vaughan Gething said it showed a "better service with a better outcome for patients".

It follows radical changes last year in the way 999 calls are prioritised.

But like other UK colleagues, Welsh ambulance crews are facing worsening delays in handing over patients when they get to hospital.

Osian Roberts is a paramedic with 25 years' experience and a team leader at the Welsh Ambulance Service, working out of Llandudno, Conwy county.

Driving the ambulance is his son Aron, an emergency medical technician.

BBC Wales health correspondent Owain Clarke spent the day with them - a 12-hour shift, which involved in two cases waits of 20 minutes outside Glan Clwyd waiting to transfer patients.