I'm about to tile the bathroom but am unsure about where to centre the
tiles on the long wall against which the bath is placed.

The short wall at the tap end of the bath has a window in it. The
opening into which the window is fixed has the usual step into it at its
bottom and top and on one side. The other side has the long bath wall
running straight into it. In other words, if you look towards the tap
end of the bath there is wall facing you above and below the window, and
to the right of it. There is no wall facing you on the left.

Long winded/convoluted description over, where do I centre the long wall
tiles? Half way between the wall at the non-tap end and the wall just
below the window, or half way from the non-tap end wall and the window
frame?

TIA

--
Frank
(Beware of spam trap - remove the negative)