Mr Villiers reacted to Villiers v Villiers  UKSC 30 with a letter in the FT on Monday, set against the general background of ‘divorce tourism’ said to have been encouraged by the Supreme Court ruling last week. Ms Villiers now lives in England however the majority of the marriage was spent in Scotland which is also where divorce proceedings were issued.
Sales J for the majority summarises the legislative background at 8:
The national legislation governing jurisdiction in cross-border cases is primarily contained in the Civil Jurisdiction and Judgments Act 1982 (“the CJJA 1982”). That Act gave effect in domestic law to the  Brussels Convention… [which] was amended on the association of Denmark, Ireland and the United Kingdom in 1978. It was replaced as the principal instrument governing jurisdiction in cross-border cases between member states of the European Union by [Brussels I] which in large part replicated the provisions of the Brussels Convention. The CJJA 1982 was amended to refer to and give effect in domestic law to the Brussels Regulation. The Brussels Regulation has been replaced by [Brussels Ia].
The Brussels Convention did not apply to issues of the status of natural persons, including marriage, nor to rights in property arising out of a matrimonial relationship (article 1(1)), but it did apply in respect of claims for maintenance. This was later carved out and titled into a separate Regulation, the Maintenance Regulation 4/2009. The UK until Brexit day chose to apply the Regulation intra-State, too, i.e. between the constituent parts of the Kingdom.
Lord Sales posits that all in all, the application of the jurisdictional rules is ‘straightforward’ (at 25) however his needing 32 paras to set out the test somewhat belies that statement, as does Lord Wilson’s and Lady Hale’s lengthy dissent at 93 ff. (and Lady Black’s at 58 ff).
There is no forum non conveniens rule in the Maintenance Regulation. The CJEU held so in C-468/18 R v P and Lord Sales refers to that judgment.
The only viable route to a stay of the jurisdiction in principle of the English courts, the place of habitual residence of Mrs Villiers, the maintenance creditor, is via the ‘related actions’ gateway of A13 of the Regulation.
Are the husband’s divorce proceeding in Scotland a “related action” for the purposes of A13? And, pursuant to that provision, should the English court decline jurisdiction in respect of the wife’s maintenance claim? At 45 Sales LJ holds that to be related actions, they must refer
‘primarily to maintenance claims of the kind to which the special regime in the Regulation applies. If the position were otherwise, and the word “actions” meant legal proceedings of any kind whatever, that would undermine the fundamental object of the Maintenance Regulation that a maintenance creditor has the right to choose in which jurisdiction to claim maintenance. On such a reading, there would be a substantial risk that this object of the Maintenance Regulation would be undermined by the commencement of proceedings by the maintenance debtor according to the jurisdictional provisions of instruments other than the Maintenance Regulation, laid down in pursuance of entirely different jurisdictional policies than that reflected in the Maintenance Regulation.’
At 48 he adds obiter (for the husband’s suit in Scotland here concerned the divorce and the divorce only) that contra to the likely position in Moore v Moore  EWCA Civ 361, even a maintenance debtor’s claim for distribution of family property with an impact on maintenance, cannot be a related action for the purposes of A13: for it would hand the debtor a torpedo against the creditor’s Regulation-protected choice.
It is on the issue of related actions that Lord Wilson and Lady Hale disagree at 147 ff., with Lord Wilson adding an arguably stinging postscript at 172 ff. At 162 Lord Wilson refers to A13(2) as ‘the dog. The reference to “irreconcilable judgments” is no more than the tail.’ A wide interpretation therefore of A13 (Lady Black, consenting with Sales, at 85 puts more emphasis on the irreconcilability of the judgments).
A most interesting to and fro of arguments and one which post Brexit will be recommended reading for the continuing application of the Maintenance Regulation in the EU.