Amplitude is good (assuming the timegrapher has the software necessary to read co-axial movements). Beat error is good.
Average rate of +8.0 seconds per day is not acceptable for a freshly serviced 8500. The delta is good (difference between the slowest and fastest positions--6.2 seconds) so there's no reason they can't slow that down. They should easily get that between 0 and +6 seconds per day. That's just sloppy work. The time it takes to adjust the timing is minimal.
If my Omega certified watchmaker had that I would tell him to get it around +1 to +3 seconds a day and he'd do it no problem. The movement is definitely capable of it.
When you say UK boutique, I assume you mean Omega boutique? Just making sure an Omega certified watchmaker did the work and not some slappy off the street.
