internal static void AddProperties(int count, string postcode = null, string address = null)
        {
            var newProperties = StubPropertyApiResponse().Generate(count);

            if (postcode != null)
            {
                newProperties.ForEach(property => property.PostCode = postcode);
            }

            if (address != null)
            {
                newProperties.ForEach(property => property.Address1 = address);
            }

            MockPropertyApiResponses.AddRange(newProperties);
        }