Dividing down a VHF signal in a 4046 based PLL loop
ADF4110 springs to mind. It needs an oscillator frequency of above 80 MHz but has got the division ratios you appear to require and easily converses with a PIC.


  So, how do I get my target frequency in this case? I'm guessing I'll
  need an additional mixer to down-convert, am I right? Otherwise, this
  IC looks great.


Just make an oscillator that runs at circa 100 MHz or use the ADF4002. Common collector colpitts is usually easier than Hartley: -




  @Andy aka ADF4002 seems like the way to go (and it's cheaper too!)
  Thanks again, as usual.