Termination is a possibility and under NEC3 the Employer has the right to terminate for any reason. As the Contractor has performed well so far, however, one of the risks is that the works may have to be completed by an alternative Contractor. You would not know how they are going to perform and ultimately you would have to pay for termination (amount due A1, A2 and A4) so not necessarily a 'cheaper' option.
I would suggest notifying an Early Warning and making sure all 'internal resources' are also in attendance at the risk reduction meeting. That way you can fully understand the impact and whether there are any measures you can take to re-sequence the works or undertake works at different times etc to mitigate the programme and cost.
If you need to go down the route of instructing suspension of the works under clause 34, then I would suggest discussing this with the Contractor beforehand to resolve any potential issues, such as use of resources etc.
I would suggest notifying an Early Warning and making sure all 'internal resources' are also in attendance at the risk reduction meeting. That way you can fully understand the impact and whether there are any measures you can take to re-sequence the works or undertake works at different times etc to mitigate the programme and cost.
If you need to go down the route of instructing suspension of the works under clause 34, then I would suggest discussing this with the Contractor beforehand to resolve any potential issues, such as use of resources etc.