The PAT guidance for extension cables says that they must always be three core (LNE) and should not exceed 12 metres in length for core diameters of 1.25mm2, 15m for 1.5mm2 and 25m for 2.5mm2. Smaller cable core diameters are not specified as far as I know, although where the cable length is longer than those listed above the cable can be used if protected by a 30mA RCD.
The 25m, 2.5mm2 extension cable should be fed via a 60309-2 (16A) plug by the way, rather than the standard BS1363 (13A) plug
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