“The power [under s.17] to order a sale of the former matrimonial home will not include a power to order possession of it. Nor should it do so during the subsistence of the marriage. To make an order, as the judge did here, for the husband to deliver up vacant possession is to make an order restricting or terminating the rights of occupation which are conferred upon the husband by virtue ofs.1 of the Matrimonial Homes Act 1983 … The judge was not asked to consider the [Act of] 1983, but she should have been. The respondent should not have been required to vacate the matrimonial home save and except where the court has taken into account and balanced the factors set out ins.1(3) of the 1983 Act .”