The exact order of assembly will depend on the preference of the builder but convention is to fit the resistors/diodes first followed by capacitors, transistors and ICs in that order.
From November 2016 a new 'V2' PCB will be supplied with a few extra components. It's the second PCB picture and can be identified by component X1 being screen printed on the PCB under V2.
After preparing a suitable working space take the PCB and start with resistors R3,4,5,8,9,20,21,23,24 and 26. Over the years these have been 680k, (blue-grey-yellow) 560k (green blue yellow) and finally in the latest batch 2m2 (red red green). Fit these in locations marked for R3,4,5,8,9,20,21,23,24 and 26 as shown:

