Can anyone recommend a good 4x4 fitter for my FFRR in the Brighton / Hove area please?

Have a look at Black Circles... or get the yellow pages out....  Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I've always found event mobile tyres good. Order online and they come to you an fit.

That said my only experience is from where I live, couldn't comment on the quality of them down your way.