Due to the recent cold conditions, left it ticking over until windscren defrosted. Noticed fuel spill on drive. Called into a local specialist and he suggested injector cleaner (diesel) he's thinking to much fuel going in.No leak when it's all up to temperature. Anybody else had this?

Let me get this right - You have a fuel leak - so the "specialist" suggested using injector cleaner?

If that is correct, I would suggest he is not a specialist, in anything other than being a moron.

You need it up on ramps, or get underneath it whilst it is dripping (obviously this is dangerous but less so on a Derv) and actually see where it is leaking from.

The FBH has a flame detector and would cut out if it wasn't burning the fuel. Obviously that doesn't rule out a leak in the fuel line to the FBH (this has a separate feed & pump than the engine)

Dan 

If the fuel line to the FBH were leaking fast enough to create a puddle the heater wouldn't start properly and the ECU would shut off the flow of fuel - so there would be no puddle. Make sense?

The fuel pump to the FBH is a dosage pump, that is the amount of fuel 'injected' is determined by the pump. With a leak that big the mixture in the pump would be too lean to burn long. As Dan said, the FBH has a flame detector - no flame in the heater>fuel pump is shut off immediately. 
RRC 2Dr, RRC 4Dr,
P38, and 2 L322s
(wife thinks I'm nuts - prob right, too)

When I first got my FFRR there was a smell of diesel after a run from around the near side headlight area, bonnet shut. It turned out to be one of the larger pipes on the right hand side of the block under the inlet manifold.. aboyt 3/4 wide pipe if I recall correctly. Just needed a tweak on the "special" jubilee clips with some mole grips. It was a bitch to get to mind. As soon as I described it on AFL (alt.fan.landrover - newsgroup) the answer came straight back. No visible leak mind.. just the smell of hot derv in the morning  2010 Disco XS TDV6, 2009 Freelander 2 GS

Previous Landrover products -1990 110 TDI CSW, 2003 TD6 Vogue - RRC TD Vogue, RRC v8 Fleetline, Disco ES V8 LPG, 101 Ambulance "Morph", 1964 SIIa Auto Powered by Jag 4.2 Lump - "Percy".

Thanks all for the help. Will take it to a local garage with ramps so they can have a look.
Found out after, the 'specialist' has gone into recievership, might answer your statement dan.