I thought the pad in the link looked really neat so I went on a Google and ebay search.
I discovered that:
There is a Geleze pad to fit every occasion: in addition to the āfishā pad you can get a 1/2 pad with sheepskin, a Gel-eze pad with a front lift and a rear lift, a dressage shaped pad, a contoured pad, a "high techā pad, etc.
And most of them come in Med and Large sizes.
HERE is the English sold fish pad, with and without risers. Including shipping the price is about 1/2 to 2/3rd of the US sold pad. (I found that for $109.)
And here is the link to the sheepskin 1/2 pad. It comes in 2 sizes. (I cannot figure out why the hyperlink did not work the second time :mad:)
http://http://www.beval.com/Products/Geleze-Sheepskin-Half-Pad-w-Gel-Spots/2079001.aspx
Coming from Bevals, the price is outrageous, but I am sure you can find the same pad in England for a lot less.
EDITED TO ADD:
Here is the ebay version of the above pad for $120. It comes in S.M and L. If you do a search in ebay for āGel-ezeā all the options will appear.
http://www.ebay.com/itm/Stephens-Gelee-Sheepskin-GEL-EZE-Back-Wither-Saddle-Pad-/290464904376?pt=UK_Horse_Wear_Equipment&var=&hash=item895efc6be5
Now I cannot decide which one to buy. 