Coordinate Transformation for Geotif

Can I ask a quick imagery / coordinate conversion question?

I have lots of historic imagery files, the imagery are all flat tif files, not georeferenced whatsoever.  I also have the corresponding .IF files (never heard of IF files) as shown below which contain georeferencing information. 

If I convert the tifs to geotiffs using the extent information below they all end up in Southern Ireland instead of Nottinghamshire UK.  Any ideas what this Cassini projection is, or how to fix this….??

I need to get these files into 27700 British National Grid

# Extent information...
extent
    minx = 28967.7430000000
    miny = 267567.5460000000
    maxx = 31381.6970000000
    maxy = 269176.9600000000
end

# Cassini Projection...
projection
    number       = 33
    zone         = 32767
    units        = 2
    ellipsoid    = 9
    parameter 0  = 6377563.3959999997
    parameter 1  = 0.0066705398
    parameter 2  = 1.0000000000
    parameter 3  = 0.0000000000
    parameter 4  = -1.1972600222
    parameter 5  = 50.6177062988
    parameter 6  = 0.0000000000
    parameter 7  = 0.0000000000
    parameter 8  = 0.0000000000
    parameter 9  = 0.0000000000
    parameter 10 = 0.0000000000
    parameter 11 = 0.0000000000
    parameter 12 = 0.0000000000
    parameter 13 = 0.0000000000
    parameter 14 = 0.0000000000
end