It could affect your funding though, depending on how your first PhD was funded. If it was research council funded and you apply to a second research council PhD they may restrict how much funding they will give you the second time.
I left a full-time EPSRC-funded PhD in 1996. When I applied for part-time AHRC PhD funding in 2003 I had to declare my prior funding. But, luckily, they didn't restrict me at all. I'm ever so grateful.