I think it's a rather cool Dr Who related plate!
well if you look at it expecting to see that then maybe until they pointed out what she was on about I didn't get it all I saw was who r8x (who are 8x)
my conclusion she has a dirty mind
Meh. Can't see it myself. Was trying to make something like Who Rakes or something. Wonder if anyone else actually thought it said what she thought it said.
Relevant: Too rude for the road: DVLA hot list of banned numberplates [The Register]
...OK, go wash your eyes out. ®