I positioned the sink roughly in the middle, there's 4.5cm to front and 4.8 to back. There are no instructions to speak of, and certainly no warning that one should stay xx from front.
You simply cannot buy 62 tops here. I tried from the start to get 62-65, and every place I went to gave me funny looks.
Eventually one place suggested I could get them custom made (about €500 per metre), and the place I ended up buying from suggested I could get the 900m double sided version (intended for islands and peninsulars and cut it down. Again this added about €1,000 to the price, so I decided to go with 60cm, as clearly if everyone has that, then all the appliances and fittings must fit...
I may push the sink back as far as it will go in the cut-out, and then fit (glue+brads) a support strip inside the front. I cut out 50.6cm as recommended in the diagram, however I actually only needed 49, so I can add a cm back in which should mean I can avoid completely removing the front stretcher.
thanks guys
Dave