I had an interesting conversation with our estate agent this afternoon. The new protocols mean that agents will be spread much more thinly and will be vetting interested parties very strictly before allowing them to view. They will not be allowing viewings to any parties who are not proceedable.
Any potential viewer will have to demonstrate that they are either cash buyers or have a sale agreed on their existing property with evidence of exchange before they can arrange a viewing.
The agent said any other position is now considered time wasting. If they're not a serious buyer, ready to go, then you ain't seeing nothing.