leak between shower tray and bottom tile

[Tonyonly]

The tiles in my en-suite start about 10mm above the shower tray and despite cutting out old sealant and re-sealing, leaks still occur. If I cut out again and fix a row of border tiles against the bottom tile and on the shower tray (with tile spacers) will this stop the problem? Is there any benefit in slanting the tiles out at the bottom? Any help appreciated.

[welsh brickie]

cut out the old silicone and any old grout,then buy a length of plastic quadrant beading, and bed it in place with silicone sealant.