Adding rights of way to title

We're in the process of buying a property that is accessed across a communal yard. The title for the yard shows that the property we're buying has rights of way across the yard, I've spoken to the owner and he confirms this.
Our solicitor has expressed concerns that the title for our property doesn't show this access at all.
They want it registered against our title also, so there are no doubts about future access. They say it may have been a mistake with the initial registration, the properties are circa 150 yrs old .

Is this a complex thing to do, time frames etc. Thanks 

Hi John P - From what you have stated, it appears all the parties are in agreement.  In that case it should not be a complex matter.  
It would not be possible to give time frame without us having received an application, but our current processing times are on our website. 
I hope this is of some help.