Leave a gap. I normally sit the tiles on tile spacers laid flat on the bath edge. 2-3mm should be ok. Don't grout along the bottom edge, just use silicon pushed well into the gap. I also normally silicon the bath to the wall before the tiles are fixed so that there is a double barrier. And, don't forget to fill the bath with water before siliconing. For best results, use masking tape along bath edge and wall to produce a nice straight line. Apply silicon, then push in with a wet finger (using a continuous motion, making sure it goes right in. Remove tape before it sets then finish off with a light wet finger.
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