Just wantd to know what the general consensus was on adding extra seating in the rear of the FFRR.

I know Overfinch and Revere do this conversion.

I came across this company http://www.blacktauto.com/vogue.htm and their seats look like they are factory fitted (I think). I emailed them and asked about the costs and fitting. As they are based in Australia, (I know!!) they can send the seats over and a good/reputable company here could fit them. The fitting I was assured is not hard at all.

Any thoughts?

Was an option we where going to use on a my10 FFRR in the end they went for a Lexus did a load of homework

Pretty much a DIY fit very well made

I question the safety aspect myself, just like 7 seater MPV's, who'd want their kids so close to the crash zone? Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top
1998 90 TUL FFR Hard Top XD Wolf
1993 90 Tdi

*Gone: L405 4.4 VSE, L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

Let the kids ride with the nanny? 

I'd be a little worried with that. For starters, the seat bases are sitting on the spare wheel cover (unless they re-inforce it?).
Also - on the V5, it says 5 seats. I'm not sure and maybe someone can confirm this, but isn't it the case that once it's registered with DVLA as 5 seats, it cannot be changed? After all, the seats are an intergral part of the vehicle, which are subject to safety inspections, MOT's etc. 2010 MY Vogue SE TDV8 3.6 Stornoway Grey- fully loaded