Getting a Computer Science degree while studying from home in the UK

It looks like the international employer I’d like to work for in 5-7 years from now is going to require a computer science degree.

But I don’t have tens of thousands of pounds and I don’t want to go into debt. But I do have the time.

WGU in the US & Open University in the UK enable you to study from home - but they are still expensive

Is there a way to study a recognized and accepted curriculum from home and then pass exams under a proctoring service - thereby hopefully reducing the total cost?