Apologies for what may seem a dumb question...

I have the FBH but no timing capability so I believe that the system is a passive operation system...does that mean that when the car is sat in the airport car park when I am away on business every 'cold' morning the FBH chugs away of its own accord...warming things without need???

No. If there is no timer system on your vehicle then the FBH only operates when you start the engine. It then looks at the temperature of the coolant, the ambient temperature and, I believe, the battery voltage. If the coolant and ambient temperatures are below certain threshold values and the battery has sufficient charge then it will start. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Thanks for the clarification...now need to find out if it can be upgraded to timed...

I'd like to get my MY13 upgraded with timed and remote heating capabilities.
anyone nearish to Edinburgh that can enable this for me? PM if you prefer

Hello Slider, just had mine done on Wednesday by flack (mick) from this forum.
Now can set timer to come anytime and warm the car up.
I think it only operates though below a certain temperature  Current Volvo XC90 R Design T8
Gone 2010 TDV8. Stornoway Grey
Gone VW R50, AUDI S8, ML320 Sport, FFRR V8
Stolen 2007 TDV8.

Slider, depends on the year of your RRS. Like this site? Buy some RRSPORT goodies to show your support!

I have a MY12 but it was built in November 2011 and if I understand correctly later build MY12's have the timed feature but the earlier build 12's do not..

As I understand it, it's available from 2010 models onwards, same as the disco4's  Bodsys Brake Bible
Software Updates Contact me
RRS Timed Heat/Remote kits - Contact me
BAS Engine Re-maps/ EGR Blank EuIII and EuIV
Clock On The Dash/ SNOTM /3Flash / BT Update /Service Reset/Error Codes read\ Gearbox Reset
See it HERE

Mines a 2012 (2013MY) SDV6 HSE Lux and doesn't have the timed capability.

I think the key word here is CAN have the capability
all after 2010 can have it but most dont as its a cost option at purchase time ...and not a cheap one for a software switch being enabled...

Find the right Indy, And the price will plumet
Harry itisme