Further advice sought on Unexpected Caveat saga please

[redsmiffy]

• 
  Further to my other thread titled Unexpected Caveat
• After receiving a Larke v Negus from the will drafting solicitors, which weighed heavily in my favour, the other side were instructed by their solicitor to lift the caveat which they failed to do.
• As a result, it expired and my probate application is awaiting approval from the registrar. I have accepted an offer on my mothers property which has to be sold to repay an equity loan.
  
  My solicitor has said I must wait a further 6 months before I can distribute the balance of the estate, to allow the other side to produce a letter of claim! Is this right considering how much they have messed my probate application around? What if I went and bought a property for my family, would I be breaking the law even though I am named as Executor and sole benificiary of Mum's estate?
  
  Any advice welcomed. Thank you.