I have a tenant renting my house since February this year. So far so good. Rent paid on time and I haven't had contact with him since he signed the contract. I'll be in the area next month and would like to call in to say hello and maybe check the state of the house and garden. I emailed 10 days ago about a prospective visit (there's a clause in the contract which permits this) and haven't had a reply. What would be the next best step?