It's the 300 that's a few quid more than the 400. But, I'm sure the 400 is suited to your needs. Not that I'm condoning your fix-by-replacement-until-it-works approach, but you know that already.
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ah this wasn't part of the replace to fix it, its simply an upgrade I was looking at from the get go. I brought a cheap pci card to see if its the lpt port causing issues, just need to configure it properly and then I should be able to use the machine.
UC300 wont suit my requirements as it offers too much than what I will use it for but from £20 more from the UC100 I might as well get the UC400.
The UC400ETH is a little more than a UC100, and a UC300ETH is a little more than a UC400ETH.
That utility effectively over rides the laptop power management's propensity to slow down the CPU whenever possible to reduce power consumption, another common laptop problem is a parallel port voltage which proves marginal for driving external logic.
You have a laptop which can work with Mach3 through the parallel port, many will not and that's the reason laptops were not recommended or supported.