Assuming I understand what you're looking for, as LCD monitors don't really refresh per-se, you may just need a monitor with higher response times. Try searching for monitors <3ms response time. This will be a more cost friendly solution if it meets your needs. There is very helpful information at this link to help you understand the differences. See: http://www.tweakguides.com/Graphics_7.html (Be sure to click the next at the bottom left to read more.)
If you truly need a higher refresh rate then first you're going to need a high end graphic interface such as a HDMI or Display-Port with a graphics card that supports the higher refresh rates. (Refer to that link I posted for details supporting this.) Also, depending on how you're images are rendered, VSync may help if you're experiencing tearing.
That said, NewEgg is a website I really like to shop on because of it's search engine. You can search by the features you need and require and narrow it down from there including refresh rate and response times. There is a Dell on their site that meets all your criteria except it's 27" and £412.99 plus shipping. You can always buy your monitor elsewhere but this site can help you narrow your search. See: My NewEgg Search
Personally, I find that Dell monitors, while good quality, are somewhat over priced and I, therefore, prefer other brands. As for other brands, ASUS is not a bad brand neither is LG, Samsung or View Sonic. LG and Samsung along with a few others manufacture their own LCD's as I understand, others buy their screens from others and re-brand them, but even LG and Samsung have been known to re-brand to meet price/demand.
As you’re probably aware, most TV’s do not truly preform at 120hz + as they claim. Also, TV’s will suffer from input lag. But they do have interpolation software in the television that adds more frames in between frames from your input (which is 60Hz. I’m afraid to get the 1ms you’re after, it just isn’t possible yet with LCD’s and current technology. 120hz at 8.333-, 144hz at 6.944, 165hz at 6.6060-, and 200hz at 5ms is the highest monitors currently available. The 240hz+ ones that I’ve seen use a TruMotion like technology, so the input is actually 120hz or even 60hz. Again these will require a high end graphics card.
If you don't currently have a high end graphics card with HDMI or DisplayPort, you'll need to see if you have a PCI-x16 slot otherwise you may have to upgrade your PC.
Here is a list of current monitors that I've found with higher refresh rates. They're all targeted for gamers, but they should suit your purpose. You may have to tweak the settings in the AMD/nVidia control panel to output the frequency you're after.
Another consideration is the method that you're delivering the media in question to the display. For example, if you're using a compressed video, the frequency of your display refresh rate will not factor in if the video encoded at 60fps. In this you'll need to use uncompressed video or video compressed at 200fps and your PC/GPU will need to be able to handle this. This is because if you have a 200hz monitor, it is writing to the screen every 5ms witch correlates to 200 frames per second. This is way beyond the capabilities of most games and videos which are typically no more than 120 fps. Though the monitor may preform at 200hz, you won't realize the full benefit unless the video is equal or higher that the monitor. For these reasons, simply a higher response time and things like TruMotion technology will probably suit your purpose.
