The data are all copied to a directory and made available from a non protected URL. In order to download the data you can use several commands. Two of the most popular are lftp and wget.
With lftp the command to run would be:
lftp -e "mirror .; quit" http://casu.ast.cam.ac.uk/~eglez/casuadc/requests/002212
Using wget:
wget -r -l1 -A "*.fit*" -nH --cut-dirs=4 -e robots=off http://casu.ast.cam.ac.uk/~eglez/casuadc/requests/002212 -P download_dir
Data are delivered in FITS files. For instruments with several CCDs all of them are included in the same FITS as multiple extensions, with exception of very old data when the extensions were written as different files.
Please note that all fits files are delivered as RICE compressed fits. Most of the software treat them in a transparent form for the user with the notable exception of IRAF. In order to transform the RICE compressed fits into uncompressed fits please use the tools at http://heasarc.nasa.gov/fitsio/fpack/. In order to uncompress a file use:
funpack image.fits.fz