Very nice, hope you have many happy miles together.
I wouldn't be in a hurry to change the bars, if you've not ridden drops in a while any are going to take some getting used to.
There doesn't look to be a lot of clearance under the guards, OK on clean Tarmac, but I wouldn't be happy with it on any of my routes. Not for any safety reasons, but when I ride my bike with close clearance (Not as close as that) I end up having to stop and clear the muck from acting as a drag brake!
Does the Audax only have one set of rear eyelets? I was disappointed that the Mercury does, I'd have preferred to be able to remove rack or mudguards without it effecting the other. I assumed it was to accommodate the disc brake, but if Thorn are doing the same on non disc models it's hard to fathom the reasoning.