At this time our best Forex broker in UK is: Eightcap. If you are finding for an alternative to Monex (mifx) you should start there. To browse all of the best brokers available for you, see our list: Forex Trading UK. If you choose to visit Monex (mifx) anyway, www.mifx.com is their website.
For more information read: Forex trading in UK legal information