I will have to have a look into that! In all honesty, I expect it won't be full spectrum as this is the UK and we can't have the great unwashed "self medicating" with products that actually work!
They banned Kava Kava here for spurious reasons and Melatonin (unless prescribed by a doctor). If people here spontaneously evolved a gland that released precisely the medication you need, they would be rounded up under "emergency legislation" and it would be forcibly removed!
You can indeed get full spectrum CBD products in the Uk, though they tend to be higher cost.
One of the best if you're happy vaping is to try CBD Hemp. It's fully legal to buy, possess and use in the UK.
There's a number of perfectly kosher retailers online (I use GetHemp but there are others). The flower products are essentially little different to full-spec cannabis except the THC is replaced by CBD (THC must be <0.2% to be legal, about 100th of the strength of strong flowers). Cost are lower than cannabis, between maybe £5 to £10 a gram roughly. CBD levels about 20% to 30%.
Personally I'd not bother with a prescription in the UK, but then I couldn't afford it anyway. NHS prescribing was made essentially legal but impossible for doctors to prescribe safely (safely for themselves as well as for patients).
So the only route is private prescription, and as may be expected in this day and age, much of that has become a business in essence (profit oriented).
On a separate (and more contentious) note, I've also spoken with a couple of people who have worked in dispensaries for the UK medical cannabis market, and have described some worrying concerns about the quality of the weed (especially in terms of consistency, but even reports of finding mould in some!!!), plus in most cases it's pot (pun not intended!) luck as to the strain you get, and worse that may vary from month to month. Since the matching of strain to symptom to person is complex and hard to predict (trial and error usually helps most people find the strain(s) that provide relief).
On my own side, I lucked into finding the best black market online medical cannabis supplier in the UK (not dealers, but a non profit collective!). They have top quality products (maybe 30+ strains at any time), a focus on clean and safe cannabis, maintain excellent prices with about the best safety and security you'll come across (they've been going under same name for near a decade now - testament to their exceptional management of the business and security).
But it's still illegal, and while risks are low (far far better than scoring on the street), it's still a crime and can impact someone's life if prosecuted. A proper prescription does at least provide safety on that side.
I'd need to be reevaluated by a physician once every other year. Odd that, since autism is a lifelong disorder....
In the UK it's every month (via the private system), I think this is to boost profits as much as anything (the appointments are rather expensive!).
But to be fair, while autism may not change so much, cannabis use and reaction to it most certainly can change, even over long periods of time, and remember, it's not completely safe (just like every other drug you can mention).