There have been several discussions about higher education lately, and schools in the UK were typically among the most expensive. I can understand why you would be interested in an online program.
Be very careful with online degrees.
If you're going for an online degree, shop around. Consider degree programs from other countries. Avoid for-profit schools entirely.
There are many online schools with high dropout rates, others have rates closer to the traditional brick-and-mortar schools. Find out those rates.
Finally, you should seek the opinions of adults in your geographic area; this includes your parents. Ask your neighbors and friends. Ask graduates of the school you are interested in, and if possible, ask dropouts of the school you are interested in.
That school looks pretty good, with a strong track record of a traditional school reaching out online, but in my opinion their tuition prices are still fairly high for an online-only program. Their tuition for an online program is nearly double the tuition charged by my three local brick-and-mortar universities. Maybe that is just because schools in the UK are more expensive generally, but I'd continue shopping around.