The 'pack' and website are quite good, plus if there is a problem it is possible to call them and Nominet are on the whole very approachable and helpful.
To be fair there is a decent timeframe to respond so leaving it late is your choice... likewise the two words could be important or not and it is likely if it was not a last minute job there wouldnt be errors? The aim is that copy is emailed and posted, at what point does a document 'change' when they have different words? There has to be a standard timeframe, rules etc and both parties have to follow it.
http://www.nominet.org.uk/disputes seems to have help section, online forms and FAQ.
From Nominet.org.uk site click 'disputes and legal' and the DRS info is there, not really 'hidden' - three logical clicks from the main nominet site to get to the DRS response form
I fully agree that a fair bit of work has to be done even if the complaint has no basis etc, however I would say the process itself is quite open and straightforward, even if the decisions and ease of complaint is not 100%
