Personally, I'd ride up myself, nothing to do with being macho (even though I'm harder than John Rambo) but I really don't think you save much time by doing it any other way.
1. Get the bike transported and meet it up there - Fuck about finding someone to transport it for you, spend the time meeting them and loading it into the van. Then book a flight, drive to the airport, check in, wait for a couple of hours, fly, let's say to Glasgow. Disembark and get through to the arrivals lounge. The fuck about either meeting your bike or making your way to where the bike is. Unload it and get yourself suited up and ride North. - Without being a hero London to Loch Lomond is a 10 hour ride including a couple of stops, another couple of hours would see you in Glencoe for the night. How much time would you realistically save by not riding, maybe 5 hours?
2. Hire a van and split the driving - Doesn't save you a single second.
If it was Southern Spain overnight then I could see the logic but not Scotland, it's just not far enough away to justify the ball ache for me.
Of course, I could be missing something really obvious?