I had real trouble finding a good cream and post shave balm in the UK. All the best rated ones online, and on the forum, seemed to be US based and extremely expensive.
I also have sensitive skins and get lots of red blotches after I shave my head or neck. My girlfriend also has sensitive skin, and recommended I try The Body Shop products.
http://www.thebodyshop.co.uk/The price is still more than your standard Gillette, Nivea, etc. But its worth it for me, as its the only product that stops the blotches. The first use, there were none! They also have offers on quite regularly, online or instore.
If anyone has other suggestions, mention below!