... I would have thought that the front pads would go first as they take more of the braking? ...
Just replaced the fronts on mine - 5 years old and just over 20K miles (was the in-laws car - in their 80s - I live fairly close to work and lockdown etc etc to explain the low miles!) but at the MOT and last service they both said front and rear pads were down to about 4mm (the local MOT guy lets me into the pit to see for myself so correct). I was thinking that maybe the rears are thinner than the fronts maybe? Or a different compound from new that wears quicker?
But as was said, get them checked by a local garage if you're wary of the advice given by Honda.
Our 2014 mk2 has done 55K, much of it local short trips, and was noted as having front pads wearing then on the MOT last year. I could see the discs are heavily lipped and there's not much pad left. Took it in (the garage is a spin-off of one of the closed Honda dealers) and asked them to change the pads and discs, and the brake fluid, as well as service the car and MOT it again.
They called me mid-afternoon and cheerily said "all done, front pads and discs are OK for now, and the brake fluid tests OK." MOT had same advisory for pads weraing thin! I was pretty miffed as I wanted them done to get it out of my mind. I think they thought I was a bit mad!
It's weird - we get so used to fighting off scamming dealers trying to scare us with un-neccessary work, yet when you specifically ask a more 'ordinary' garage they seem reluctant to anything that isn't essential!