Clearly East is continuing the pre-empt, leaving me with few options. The best I could think of was to double, hoping partner would take it as 'optional', taking out or passing as he sees fit. He, perhaps, wisely chose to pass.
4♠X went 2 down which was rather disappointing seeing as we have an all but solid 6♣/6♦ (or 6NT if ♠ are led).
All at the table agreed I had no way to advance. Is there one?