Any particular reason why you want to put a £50 amp on a pair of £200 studio monitors?
Also, have you bought the speaker, or are you simply considering buying them.
And, for what purpose? Home Recording Studio? Computer Speaker? TV? General Stereo?
Also, for what purpose you intend to use the speaker will help us determine whether it is suited to your needs. Nothing wrong with the speaker you've chosen, but if you plan to throw wild drunken parties, this might not be the right speaker. For casual listening at home, it should do very well.
If you haven't purchase anything yet, give us a working budget, and what you would like the working budget to buy you? Then we can see if we can make some better choices for you.
If you have the speakers already, are you sure you can't come up with more than £50 for an amp budget? If you an come up with a little more money then I think we can find prices better than Conrad Electronics.
Depending on how you intend to use the speakers, have you consider the same speaker, but with the amp already built in? -
Tannoy Reveal 501a Active Studio Monitor | DV247
Tannoy Reveal 501A - Google Search
Tannoy Reveal 601A - Google Search
Also, if Active (built-in amps) speakers would work for you, there are many others we can suggest.
For example -
Google-UK Shopping - KRK Rokit 5
Google-UK Shoppig - KRK Rokit 6
For a similar roughly £250 price tag, and in separate components, consider these -
SuperFi.co.uk - Wharfedale Diamond 9.1 Speakers (pair)
SuperFi.co.uk - Pioneer A209R 35w/ch Amp with Remote
Steve/bluewizard