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Certain modules count towards a lot of different degree courses, meaning that there may be a lot of people wanting to do them. From the above list DD131, DSE141 and DB123, in particular, count (or can count) towards a ludicrous number of different degrees. There’s no guarantee that there’s space on any of the modules listed above, but if you’re interested in doing anything likely to be popular, it would be a good idea to register as soon as possible.
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Even if you’re confident that your chosen module is so obscure it won’t be full, don’t forget that registration for each module usually closes about a month before the module starts – so, if something starts at the beginning of May, you won’t be able to suddenly decide on 30th April that you’d like to sign up for it.