Mr Smith said: “I think there is a fine line to tread.
“If they are just going to Scotland to fly the flag as it were, it is not unreasonable for the head of state and the royals to do that on her behalf.
“But if they start doing things that are advertently pro-union in the middle of a Scottish wide debate about independence then I think that is crossing the line and they need to be very careful.
“If they cross the line too far it will play into the hands of the independence campaign.”
In June, Colin Blazier told GB News the Royal Family will need to do more to overturn some feelings regarding independence and republicanism in Scotland.
Mr Blazier said: “Scotland is more inclined to republicanism than England.
“Not by much, but enough to give courtiers sleepless nights, especially with another independence referendum looming.
“This is the context for the Queen’s presence in Scotland – for what’s known as Holyrood week.
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“But what about her grandson? What kind of kingdom, how much of a kingdom, will be left for King William the Fifth.
“Part of the sovereign’s Scottish problem is the way she sounds.
“Her ancestry may be Scottish, but for a new breed of nationalist, accent can seem like a hallmark of authenticity.”
“William studied at St Andrews University, it’s where he met his future wife, and our future Queen, Kate.
“But occasional visits won’t wash. A few weeks in Balmoral over the summer will not convince wavering Scottish royalists that the institution of monarchy is as committed to Aberdeenshire as it is to Ascot.
“William and Kate, and their beautiful children, should MOVE, and LIVE, and WORK in Scotland.”
Source: EXPRESS CO UK