A UK example could be
flying Fairoaks to Lydd with the intent to shoot an approach.
I would depart and contact Farnborough for a service (but not even mention if I was IFR or VFR). If I was in IMC I would probably let them know if they only offered a Basic Service.
I am going to remain below the TA so IFR is just the terrain seperation requirement.
If I entered IMC I would let the radar service know in the call to upgrade to a traffic service.
When 20 miles out from Lydd I would call "inbound for ILS xyz with information alpha" and then get on with the approach.
They will then respond with a procedural approach clearance.