Hi Alison -
It’s a conundrum isn’t it? I’ve long thought that the post epidemic development of staycations would mean the more popular routes would have all the best accommodation snaffled in advance by the big tour companies. In reality, I’ve no real idea if that is indeed the case, and the return to foreign travel may have seen more of a return to the previous norm.
That said, my feeling is that if you are booking in an area where you are not familiar with the available accommodation it might be best to turn it over to a company that guarantees you at least a minimum level of accommodation, even though standards may vary from place to place. So when I was booking our trip across Devon a few years back, it not being my neck of the woods, I was very happy to turn the bookings over to the marvellous Encounter Walking Holidays, including baggage transfer, the full works, much to my wife and friends’ surprise and thereby putting a large dent in my reputation as ‘hard man of the hills’.
Conversely, when booking the Pennine Way a couple of years later which is in an area I’m extremely familiar with, I did it all myself, confident I knew what I was getting and where, although it wasn’t, as it transpired, totally incident-free. But there were no major alarms or disasters. I did cost up having our baggage shipped to each location on a daily basis, but decided that the cost, if not prohibitive, would have paid for another holiday, so ultimately relied on the kindness of friends to replenish our kit halfway along the route, which I realise is not possible for the vast majority.
I would therefore, in your case, definitely store my main bags using the methods outlined by other posters and carry just what I needed to complete the trail. One set of walking clothes and one set of ‘best’ clothes would be the norm with a pair of shorts (maybe), extra socks (definitely) plus extra layers and head to toe waterproofs, and minimal first aid and ‘ablutions’ kits. And the dry bag of phone chargers, cables, power packs etc. I’m sure you’ll be able to find suggested kit lists online (You Tube is bound to have several).
I too googled Macs Adventures and found their costs to be far cheaper than what you have found so far. I also searched ‘west highland way best travel companies’ and that threw up several more as alternatives. It might be sensible for you to add ‘U.K.’ to your search description as well and book through a U.K. based company.
Finally, there’s nothing to stop you walking north to south (other than the prevailing weather is likely to be in your face), but I can’t think why you’d want to. It really is better walking Milngavie to Fort William. Don’t forget that it’s possible to get back from Fort William to Glasgow in a couple of hours if you hit the connections right. It’s one of the most convenient (and occasionally disappointing) aspects of British walking - it could take you days to walk to a destination and just a few hours to return to your starting point!
Hope you have a great trip - it really is an excellent walk!
Ian