You don't need a paid subscription to Fold3, you just need to be signed in. I've had no problem downloading these images for free.
I've found the search results on Ancestry (using Peter's link) to be a bit hit and miss though, every time I hit refresh it seems to bring up a different number of hits. Could be a wider issue with the site?
EDIT: Just to clarify, the records are free on Forces War Records, the UK version of Fold3, but apparently not on Fold3 itself.