> does the CTO need to be part of a company that you worked/still work for?
No, there's no difference, it can be any company. Moreover, there are no requirements about whether this company or person needs to be from the UK; it can be any country in the world.
> does the CTO need to be part of a company that you worked/still work for?
No, there's no difference, it can be any company. Moreover, there are no requirements about whether this company or person needs to be from the UK; it can be any country in the world.