Hey there Tazzy,
Yep, ya gotta love 'em.
I know I'm asking the obvious here but you have put the transmission back into a forward gear and driven forward a little haven't you?
I find on mine that while almost every time it will light the dash and console lights and you'll hear the transfer case mesh, very occasionally you have to move for it to actually do all of that. You should at least get the dash light (in the gear indicator area on the instrument cluster) to flash while it attempts to engage the low range gears. If even that bit isn't happening then there's definitely some sort of disconnect in the process. This is the part where moving forward makes the flashing Lo indicator stay on constantly. This does happen only very occasionally though for me. It all usually only takes a couple of seconds but if you're stationary you should be able to here the actuator operate.
Possibly not your problem but asking just in case.
As for fuses, I can't remember if it's 13 or 33. I think both are labelled as transmission but one is the TC actuator (among other things possibly). I'll have to look at the electrical diagrams to be sure. I'll have a look tonight.
If it is the switch, and I hope it isn't 'cos they're a pain (and expensive) to replace, check that the circuit board under it is the same model number as the original. I think you have to replace the whole panel. Strange things happen when the wrong one for your model is used.
Do you have access to anyone with a diagnostic tool as it may, just may, be reporting some error that can be tracked to an obvious cause.
Anyway, sorry for the obvious questions, good luck with it.
03MY Range Rover HSE Td6
Nudge Bar, Sat-Nav, Cargo Barrier, IC-450, IC-706 and Codan 9350, DT-90 DBS, Chipped!
LROCV DTU member