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I purchased porcelain tiles that are 20cm x 120cm ( looks like wood planks). The builder told me they weren't perfectly flat. If you lay two side by side they are flat but as they are to resemble a wood floor effect they would be ar staggered intervals. It seems if you lay them looking like bricks the middle of the 120cm tile (at 60cm) would be around 1mm higher than the edge of the tile it is next to. Is this normal or not?

There were by no way cheap tiles, they were around £70 a meter on sale from their original price of around £95 a meter. The tiles look amazing and the varying White washed oak grains and swirls vary on tiles and there are around ten different tiles so it does really look like wood.

In effect the middle of the tile sits 1mm higher than the ends, so they are slightly bent.

I could not tell you what the specification on tiles might say about tile size variation, but there will be + and - limits!
Recently I had exactly the same problem with a 300 x 400 Stone effect tile which I also tiles as brickwork half bond pattern. I tended to try and tweak the odd one and when grouted looked fine.

In your case you could help your self by changing the bond to suit your tiles.
Try laying them out with a varied overlap, say 15cm and even 20cm. I dont see why this couldn't be changed and you will be able to tell by laying it out dry on the floor.

davyp1