Well when shows are re-run (at least in the UK) they are always shown in order. Even the multi-part stories which are shown over the course of a few nights.
And even if you miss a few episodes in a serliased show the "LAst Time/Previously" shows you the basics of what you missed and need to know.
Yes, how programming over seas is run is very different than it is here in the US. I'm not sure if it was this post or another one but I had mentioned Trek in general seems to be more appreciated in the UK than in the US. I know in my area (NY tri-State), DS9 was barely rerun at all due to it's tight arc' based story. It wasn't until it reran on cable that folks could watch the entire series again. TOS, TNG and Voy., until a fairly recantly reran in syndication all the time.....but out of order.