Several airfields with ATZs in class G use instrument approach procedures. In most cases, the procedures are not obviously apparent from using a 1/2 mil VFR chart. Procedure details can be found in the AIP here under ‘Part 3 AD2 aerodromes’. Which isn’t easily accessible but can be useful information.
Where an airfield utilises an instrument approach procedure, the VFR chart normally includes a ‘feathers’ symbol that radiates up the approach path.
If you cannot avoid and need to cross an instrument approach in class G, or fly overhead or close to an ATZ, plan to talk to the controller in good time providing details including your position and intention. That will help you and any instrument traffic that may be using an instrument procedure to avoid a potential conflict.
By operating knowledgeably, safely and responsibly with all airspace stakeholders in mind, we can all contribute to maintaining safe use of class G airspace.