Size of Tiles Query and best solution

[brendanolear]

My bathroom is half tiled. Bath has four tiles in height and border around full area.

I was intending to extend to ceiling and went out and purchased what I thought were standard tiles 200x250.

On setting them out dry, I discover that although the new tiles are 200x250 the old tiles are more like 197x250.

Is this an old size and can such things still be bought. If not, could I get away without placing spacers?

Or, should I attempt to strip existing off platerboard walls, is it as much bother as it seems?

Any other solutions?

Thank You.

[white pan man]

If you have a boarder,maybe start top tiles ,with tile centre to bottom grout line,so they are brick effect on top layers