Hi Bill
It's not the slip in the throat that bothers me. That's an improvement on the original as regards eliminating reverse curves, the only potential issue being the tight radius of rtr slips, which of course doesn't apply if you're building your own track.
I've sketched your plan below (on the right), next to a version of standard Minories that also uses a slip (and has an additional crossover, of which more later). Most of the track below the dashed line is the same on both. Above the line you have changed the access to platforms 2 and 3, and added a trailing crossover A.
(Sorry for the small size of the image - I don't have access to decent drawing software at the moment.)
So my points:
- rearranging access to platform 3 has allowed arrival into that platform simultaneously with departure from platform 2, which Minories does not (I confess I hadn't noticed this when I posted before);
- however, unlike Minories, an arrival into platform 2 blocks departures from platform 1;
- the extra crossover A through the tandem adds nothing, as departures from platform 3 still block the whole throat just as if they were going via the slip;
- so on balance, your layout actually has about the same operational flexibility as Minories, but uses more points and is at least one ordinary point plus a tandem point longer.
If you want simultaneous operation of platforms 2 and 3 in Minories, a better way to achieve it IMO is just to add an extra trailing crossover (B in my sketch) as this doesn't affect any of the other movements already possible and may be slightly more compact.