Variability in /r/-liaison usage in non-rhotic accents of English has been explained by reference to linguistic, sociolinguistic and phonetic factors. This paper looks at two phonetic factors that might condition such variability: a) the type of vowel phoneme at the end of the syllable likely to make the link; and b) the presence/absence of /r/ at the beginning of that syllable. A corpus of Received Pronunciation (RP) English newscasts from the years 2004 and 2005 available from the BBC Learning English website  was investigated. Potential contexts were detected and analysed auditorily. The results show that intrusive /r/ is more frequent after back vowels than after central vowels and that the presence of /r/ in the syllable that would make the /r/-link does not seem to have a great effect on the presence of /r/-link.