So let me get this straight. Other pilots are likely to be inbound to the same airfield and intending to carry out the same iap, probably initially working the LARS frequency until clear of conflicting traffic; you've not called your destination to ascertain if they are aware of any other traffic and to pre - warn them you'll be doing an iap, right?
Basically yes but as the AIP says the initial contact will be with the field tower so i guess they are getting "pre warned" and most likely in the scenario i describe one would be coming from the opposite side of the MATZ and not talking to the LARS
The example I use is approaching Dundee from the north west perhaps from the direction of Coupar Angus