Pretty sure if your satellite doesn't fit on the back of a lorry you're going to have a hard time launching it from anywhere. What does this even mean
Here's a reference that's totally on point:
http://mstl.atl.calpoly.edu/~bklofas/Presentations/Developer...
"An Evaluation of CubeSat Orbital Decay" - everything you wanted to know (and more!) about the topic.
It's also handy for satellites constructed in Glasgow by ClydeSpace and others: https://www.bbc.co.uk/news/38804310 "In the last two years Glasgow has built more satellites than any other city in Europe".
You could fit that kind of payload in the boot of your car.
It is actually relatively accessible compared to the other two proposed spaceport sites, which are both on relatively remote islands: Unst on the Shetland Islands, and North Uist in the Outer Hebrides Islands[0].
[0] http://www.shetlandtimes.co.uk/2018/07/16/unst-spaceport-sti...
But it's hard to get my satellite there, and the weather there doesn't seem ideal for launching rockets.
I'd expect the east of the UK to be better for both access and available launch dates. Perhaps air traffic corridors are a problem.