We have given our tenants notice that we are not renewing their lease when it expires in May. This is more than the required notice. We have asked repeatedly (Texts and three letters) to allow the gas company in to undertake the required gas checks which are due for end February. Tenant doesn't reply. Obviously we will not just enter the property but what else can I do? Tenant has previously answered texts, always paid on time. We are aware they don't want to move and have lived there 4 years but we are going to sell the property so cannot extend the lease when it runs out.Have offered to give them a good reference but I'm now very disappointed with them.