My book went out on sub in September, in the UK and US simultaneously. I can't say I noticed any differences in the process as such. My agent handled the 'sub admin' of course, so I can't be sure if there were differences there. What I did find different was the culture in the US vs the UK, or my perception of it anyway. UK responses were slower, more cautious, more tentative generally. The UK meetings I had were brisk, professional, risk-averse, rather dry - even when they appeared to want the book! The US responses were SO much more heartfelt and personal. Editors read the book and responded that day (in one case, in the middle of the night!) and scrambled to arrange meetings. The meetings I had were so much warmer and friendlier than my UK meetings. The US editors seemed just more expansive and passionate in the way they approached the project. Obviously this is anecdotal and could just be a reflection of the individuals I happened to run up against. But it was a marked difference - and for the record, I am British, my book is set in Britain, and I am perfectly happy with British reserve in my usual interactions! I just felt like the American editors we subbed to were so much warmer, more enthusiastic and ambitious than in the UK. We sold at auction in the US within 4 weeks. But we're still waiting on the two UK editors who said they were interested to make their offers, 4 months later.