Although sometimes a look at the SRD won't hurt. In FlightPlanPro, if you select the Utilities menu there is an item called SRD lookup. You can then put a departure or arrival and it will look up all of the SRDs that go to/from that point (it also includes FIR entry/exit points). This can be particularly useful if FPP is struggling to get a route through the TMA.
In this particular case it doesn't matter as there isn't a standard route between these two fields. However, there is one from EGTK (which is the closest and on track) and this is DCT MALBY DCT OF, which is pretty much the same ground track as DCT BZN DCT.
In previous posts, controllers have indicated climbing traffic up N859 or A34 or Q41 and then descending it down L9 is easier than routing across near KIDLI. I am not a controller so don't know if this is true. What certainly is true is the controller will point you where he needs you to be regardless of your planned route.