Where'd you get that from? FPV is illegal for VLoS operations (pretty much every operation unless again you have special exemptions from the CAA), regardless of having an observer or not.
And regardless of FPV, the limit is 400ft.
They have made a change for FPV (non commercial I think). The key is you are flying a SUV, so under 3.5KG and have a observer. The document seems to be a exemption of other rules.
http://www.caa.co.uk/docs/33/ORS4%20No.%201011%20Small%20Unmanned%20Aircraft.pdf
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