This is quite widely written about. This king would get England, the Netherlands and Franche Comte with the Spanish side of things going to someone else in the Habsburg family (can't remember who)
This stronger, catholic England would spread its power over Ireland with no Spanish help to counteract it and no religious aspect to rally lords against them. Ireland could well end up almost entirely assimilated into England.
I'd imagine it becomes even more 'supressed and dominated' as you call it.Ireland that isn't supressed and dominated, and further is allowed to openly be Catholic, and eventually may be under and independent Habsburg King...
*drools*
This stronger, catholic England would spread its power over Ireland with no Spanish help to counteract it and no religious aspect to rally lords against them. Ireland could well end up almost entirely assimilated into England.