DaveyLC, I get where you're coming from with your last reply just really needed to get it straight in my head that I was doing the right thing and had looked at all the options!!!!!
I've ordered the DJI F450 bundle today, worst case scenario if I do want to upgrade to the disco pro in the future I've got most of the bits which without a bundled deal the Naza 2 would be £312 alone and I'm sure I could sell the 2nd hand HD3 Gimbal for £150 approx so to me for now it seemed like a bit of a no brainer to be able to try without too much of an outlay initially.
Once again thanks to all for your input has been much appreciated!!!!