When it is A/G, never ask for "taxi instructions". The answers is likely to be something like: reduce power to idle, release the brakes, increase power until A/C starts moving and immediately reduce power to stop A/C from accelerating beyond control. A/G radio operators cannot issue instructions so don't ask for them.
"Where would you like me to park (for 30 minutes/2 hours/overnight)?" asked on the RT generally does the trick at any airfield you visit.
I would be careful with the suggestion from Fly Stimulator. Better a long taxi to the runway exit than going of the end because you are trying to be smart.
In the US they use something called progressive taxi instructions if it all gets complicated. No reason why you can't ask for it here. I am sure most ATCOs rather have you ask a few clarifications as opposed to blundering onto an active runway.
Finally, use common sense. I know it says in the book to vacate left, but if there is nothing to the left of the rwy apart from a bit of grass, and you then have to cross the active runway to get to the parking area, you haven't achieved anything by doing it by the book.