Dan:
3 miles to work each way and you’ve not had a regen yet? I’m amazed, unless your other driving is long enough to keep the DPF clean. Running in really isn’t much of an issue any more with tighter manufacturing tolerances etc. Just drive it normally, babying the engine is as bad for it as hammering it while it is running in and after 1000 miles you can do what you like to it. I ran a TDI in badly once (picked it up from a broker and drove it on a 700 miles round trip all at motorway 6th gear cruising. That car had a thirst for oil, the mpg was crap and the power seemed on the low end of expectations for the car (Golf MK5 140TDI PD). The first 300 miles are most important from a safety point of view because it takes that long for the brakes and the tyres to be scrubbed in properly and working to their potential.
If you haven’t read much of the other threads, you might not be aware to avoid Shell V-power like the plague. It’s expensive but makes the car around 10% thirstier and less powerful because it’s got a lower density than regular diesel. The only thing it has going for it is that it’s clean (as fuels go) and might see you regenning a little less often. I’ve seen best mpg results on standard Esso and BP.