First of all, welcome to HBT.
The buckets in the first link most likely have a hole in the lid with a gromet that will allow use of an airlock. The photos don't show the lid, but I'd bet they're there.
Many of us use glass carboys or "BetterBottles". I prefer the better bottle since it's lighter and safer than glass (won't shatter). Carboys/BB's are more fun for a beginner since you can watch the fermentation without opening the lid (which introduces the risk of infection).
Here's the link to BetterBottle. I'm not sure if they're available in the UK, but they may be. click here
If you use the search function, there are numerous threads about the benefits of the various fermenter options.
Good luck with your brewing.