Leuchars LARS was and still is H24 (though probably not for much longer) so the inbound CATs should be talking to Leuchars at weekends too.
We used to regularly get asked by Leuchars for co-ordination against Dundee CAT inbounds while operating instructional flights over Fife (along the lines of 'can you accept not above 2000ft VFR till advised?')
NS