Well, I think those brokers named in first post are the ones that you have to use with prop firms such as ftmo or ffm.You are absolutely right brother! The main thing is to choose a quality broker with a trading server located in London. I personally always ask about this before opening a real account with the broker's technical support in order to have such a location. After all, some brokers have demo servers and real servers located in different parts of the world, this also affects the result.
Hence there is not much choice. I think eightcap's servers are located in Tokyo hence I would look for VPS somewhere around there as latency from eg London is probably 100 to 200ms maybe more.
If someone has experience with them please advice good vps for those brokers.