Hi 'Ulsterman'
There are certainly many ways to achieve the same outcome, and this would be one of them.
It would probably have meant that I could have left all the wiring as is - but where is the fun in that !!

I also didn't want a second motor whirring away constantly, and as I'd need at least the 2.2kW, at £566+VAT+postage - pushing £700 for one of these, this is far more than what I've spent on some second hand VFD's and some wire!!
The 2.2kW version is also a 15A input, so couldn't run off a 13A plug top.