I wouldn't do computing at all at the OU. The modules are embarrassingly poor. I'm currently attempting to finish up but fighting against illness and chronic pain. The current programming module I'm on(one of the only options available this year) is pitiful, as yet I've done about 2 hours reading before a bi monthy online multiple choice quiz, two tmas for the course and an exam at the end. Compared to an equal level 30 credit maths module it's maybe 1/20th of the work load. Some of it is repetition from other programming modules and maths(logic parts, it's an algorithm module).
ALl the programming and computer science modules I've done so far are painfully easy, light on work and nothing you couldn't buy a book and learn yourself over a week off. The maths has more practical use because it's actually a decent amount of work and can be very difficult though the downside there is all the videos/audio from maths modules haven't been updated since at best, early 80s, it's equally pathetic.
I think it's a rip off at the transitional pricing, as in the prices before tuition went up, at current pricing it's a complete joke. You're going to be paying what, 5k a year for nearly no teaching, ancient modules and for computing, extremely little content.
Use edx or other online courses, teach yourself, write some programs and when looking for jobs use stuff you've achieved as a portfolio. The OU had absolutely no reason to increase pricing, their costs are nearly non existent, they provide pretty average/poor materials and spend no effort to update them. At least a real uni has to build new housing, improve facilities and provide actual teaching to every student throughout the module and the idea was the increase in pricing was to stop government subsidising them so much, OU has no such excuses, crap facilities. Currently living in Milton Keynes..... where the Open Uni headquarters are, I'm partially disabled and can't travel much at all so my tutorials for my maths modules are in.... Southampton. The online facilities are a complete joke, tutors whose equipment keeps crapping out and invariable one loud mouth idiot who speaks over everyone constantly so you can't hear anything.
OU are stuck somewhere around late 90's in terms of internet facilities. I've had a single good tutor who actually talks/communicates with their students effectively and he's upset with the how badly downhill OU has gone in the past decade. It's all about numbers and money when it used to be about teaching people... like most unis but even more cheap about it.