With regard to the ABS, TC and speedo, this is a well known about problem on this forum and many people have had it unfortunately.
It points to the ABS ECU being defective. (The speed signal goes through this, so ABS, TC, speedo, speed sensitive power steering, trip computer etc will not work) The problem appears to start intermittently then get worse until total failure.
I have heard Vx charge up to £900 to fix.
DIY methods include refurbishment of your own part from a range of companies (which many people including me think is best), or obtaining a 2nd hand part, but this needs to have the same part number and be off the same engine size/year etc. Cost of refurb in the region of £130.
There is a guide in the maintenance section telling you how to get the ABS ECU off. It's not straightforward but doable.
HTH
PS
Forgot to mention, some lucky people have manage to solve the problem by cleaning their ABS sensors on the rear wheels which of course is a whole lot easier!
I don't know much at all about auto electrics, but have you got a lose connection/eartch connection somewhere to cause the car to cut out?
Welcome to the forum aswell!