AlonhYou've had all the traditional Hifi brand usual suspects identified above, but given these are to go on your desk and not by the side or behind - I would look to go for something actually small, and run a little sub underneath if that's possible?
My office setup is a Dali Zensor 1, a conventionally small speaker like all those mentioned above... but no way would I want those actually on my desk, simply much too large!
You could try and find the Dali Zensor Pico, but they stopped selling them so at the mercy of 2nd hand.
However if it were me I'd go for these.
Kanto Yu4 Passive: £159
Pair Kanto YU Passive 4” bookshelf speakers with an amplifier of your choice and enjoy your favorite tunes the way the artist intended. Featuring 4-inch Kevlar® woofers and 1-inch silk dome tweeters, these speakers produce a neutral, balanced tone.
homeavdirect.co.uk
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With the matching Kanto Sub6: £189
SUB6 is a sealed box front-firing subwoofer offering 200-Watts of powerful bass extension. A precise low-pass filter makes SUB6 a perfect match with any Kanto speaker, allowing you to dial in the perfect cutoff frequency. Its 6-inch paper-cone driver enables true sub-bass reproduction with...
homeavdirect.co.uk
Or they do a Sub8 but it's pushing the budget then too much?
I've not seen any alternative passive mains to the Yu4's really, certainly not ones that look as nice aesthetically. However subs lots of choice, though many are likely to be trash, a couple of other subs similar value that should be decent though:
Wharfedale Diamond SW150: £149
Amazon product ASIN B0036EEOSQ
Presonus Eris Sub8: £158
Amazon product ASIN B08VYLVC4M