I am just in the final days of finishing the subsea engineering course part time at Cranfield.
Some things to note:
1. The course is not as technical as I expected, it is more an overview of the whole of the subsea engineering without going indepth
2. The course management is shockingly bad (although the content is ok)
3. Lots of the lecturers are from industry which is great but some are more interested in telling war stories than teaching
4. There is a lot of sales pitches for products from industry
5. Expect to be one of a very few europeans on the course (this is great for experiencing other cultures but be warned that those from Africa will constantly be begging for extra marks and constantly complaining that the course is too difficult. They will try and coerce you into agreeing with them. Expect many emails from them about this)
6. The course is not too difficult
7. Finally, the best part about being part time is that the deadlines do not apply to you. They will not tell you this but you get to tell them when you want to submit assignment!
If you would like any more info on the course give me a shout.
Ps. 8. As a part timer you get as much free food (snacks and lunches) and costa coffees as you want!!!
Pps. you do not need to do 4 weeks straight. You get to pick your modules and can do them in any order. I alternated 1 week work, 1 week Cranfield across 8 weeks following the exact same 2 year plan as you. Be prepared to loose Christmases for for 2 years as the exams are just after christmas and can start as early as 3rd January.