Thanks for all the responses. I have picked up Bloodtide, which seems pretty good for what I want (more horror-themed). But it really could have done with some proof-reding (I'd say better proof-readingexcept I cannot believe it had any. The table of contents if in alphabetic instead of page number order - I mean come on! That is simply awful. And what do game companies have against including indices!. I won;t get started on the missing rules as other threads cover this).
I like the look of Mythras, so I'll probably try to pick that up if I can find it in the UK in physical form, and look at the Constantinople book, but my setting is exploration of ther New World, so probably not ideal for this game, but for spoudns good for doing an earlier mediaeval game which I expect to get round to at some point.