Hi Graeme,
I am also in central Scotland and working from a single garage, building furniture for my own benefit as I have a full time job and it is just a hobby to keep me sane. I started with a larger bandsaw and built my first item, a single cabin bed for my son with only this, a workbench and hand tools. Progressively I have added a Sedgwick Planer thicknesser and I am still rebuilding a small Startrite Ta145 saw. I have posted on some of this elsewhere on this forum including building mobile bases. I have been lucky to acquire a lot of kit secondhand but also bought new with a Festool TS55, replacing a similar DeWalt track saw. I don't think I can add much else to whats been said, it depends what you are building. Personally, the track saw has proved invaluable but there are some jobs that it's not suited to hence I will be completing my table saw refurb this year.
I am out of the country this week on business but when I get back I will post some photos of my single garage workshop. It's probably true that a larger workshop would be even better but I console myself in the knowledge that some people are turning out much better things than me in a lot less space.
Best regards
Nigel