No problem accessing their website.
However, from their "Status" pages:
123-reg Services - Thu Apr 1 11:47:22 2004
123-reg customers may see some intermittent problems with some of 123-reg's services due to a recent DNS error. 123-reg has rectified the problems with the DNS however some customers who's ISPs use DNS caching may experience continuing problems until their ISP refreshes the cache.
Services effected include:
FTP to hosting
I do also remember seeing an issue posted on "POP boxes" a week or so ago but nothing recently.