Is there a way to make a character/vehicle follow to spline line rather than just move from point to point, so it would follow the curve too etc.
Yup, with those:
Provide Time / Distance and Coordinate Space (most likely World in your case) and the Return Value will provide location, rotation and scale.
This has been covered nicely already, it seems:
https://www.youtube.com/results?search_query=ue4+move+along+spline
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That’s great thanks, I’m guessing I would only need to use one or the other?
You’d use only one.
Time is somewhat easier for the human brain to work with. If I give you a long spline of unknown length and ask you to point to a spot at 42% of the spline, you’ll have no issues. When you work with Time, you can work in a unitless fashion. Or you can work with actual Time, if you wanted to move to a location that is 3.5 seconds away, you can:
And there’s also Constant Velocity toggle for Time. Wouldn’t work well for a rollercoaster cart but could work well for a camera rig that needs to move in a very specific fashion.
If I give you a spline that is 7380 uus and ask you to point at the point at 3000 Distance, now you need to apply some mental gymnastics or worse, do math. 
Both have their uses - kind of depends on how we approach things. You can use both simultaneously, but you do not need to.
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Thank you so much for this, I’ve not come across them before! Heavy night of head scratching to look forward to haha
To give you a headstart:
With spline duration set to 5s and Speed of 1, a single loop should take 5 seconds regardless of framerate:
If you need more control over the movement, do look into Timelines.
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I want to use it for race car ai, so I need to work out the acceleration and steering etc along the spline path but these will help massively thank you
Consider moving a dummy guide along the spline with some offsets. The vehicle AI should try to catch up with that guide. This would give you a more life-like intent behind the steering logic, as if there was a purpose.
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