Sadly the DTI seem to have invented a new format and used an existing well known extension for it.
An Ascii grid file (a raster) would start with 6 header lines and then the data. These files contain:
Each ASCII file has a header line with information about the source file,
file type etc.
Subsequent lines in the file have the appearance:
Northing) speed; speed; speed; etc.
Easting The East
co-ordinate to the first value in the line
Northing The North
co-ordinate for that line
speed Is the wind speed estimate for
the kilometre square
There are 100 wind speed estimates in each line of the ASCII file. East is incremented by 1 for each new wind speed
estimate. Each of the wind speed estimates is delimited by the
character ';' so that other software packages may separate each of the
wind speed estimates. This is a fixed-width data file.
Which has to be one of the worst file formats I've ever seen. I think you will need to write some custom code to read this junk.