Thanks for the info - I was not expecting anything that fast.
I will do the update tomorrow as I have gone back to using 3G network - it's fast, but looking somewhat ureliable. Getting fed up with it, but TalkTalk is so slow here - not much chance of it getting better.
All remote functions now working OK.
I did not go down the update route given the problems with broadband at this time. Instead I logged in via putty, found the file for the Samsung remote and edited it with nano.
Thanks again for your assistance with this issue.