Good stuff Steve.
If I may add one or two minor points ....... assuming you're going down the lamp-on-rifle route..........
When setting up your lamping rig, make sure that the pool of light from the lamp actually illuminates the area visible through your scope.
Don't ask me how I know this to be necessary.
Test the rig in the dark - you want the quarry to be lit up - not your barrel or scope end (it screws up your night vision and ability to see clearly through the scope beyond the light pool)
Make sure you can easily reach and operate the light switch in the dark! Don't ask me how ..... etc
In short, do a dummy run with your rig before going out for real. Yould be surprised how many minor mods you make to the setup.
Finally, I had great success with backlighting rabbits when I lived up in Aberdeen, an idea I got from watching a bunch of them playing under a street lamp. I built a lamp system with a radio controlled switch (cheap from Maplins) which I prepositioned before darkness so as to illuminate behind
the quarry. When switched on, it outlined the rabbits in a soft glow and enabled me to quietly pick them off with a well-silenced 12fpe PCP from about 40m out, and without spooking them with flashing.
HTH and good luck Dave. It's excellent fun night shooting, and my favourite.