Normally what tends to happen is that there is movement of the worktop/sink
as apposed to the wall or structure with the tiles and this eventually lets
water in as the silicon gets hard with age. I've never found a totally
foolproof way myself except every so often redoing the silicon.
Not me any more, thank goodness there are limits to blind handyman skills
and all that stuff. grin.
Brian

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The Sofa of Brian Gaff...

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I'm thinking (quite a long way) ahead to fitting the worktops and sink and
want to devise a way to solve the problem of the area behind the sink that
always gets wet and manky. SWMBO wants oak worktops and a S/S 1.5 bowl
double drainer sink (from Franke) so under-top sinks, corian, ceramic,
etcetera are all ruled-out.
The ideas I've had thus far a to build-out the area behind the sink so
that it slopes and, when tiled, slightly overhangs the back of the sink,
or to fabricate a S/S wrap for the upstand behind the sink such that any
water is directed onto the sink. Has anyone come-up with other ways of
solving the problem?