Garden knifes

looking for a new garden knife suitible for varius jobs at work i.e pruning clipping hacking and cutting string, willing to ay up to �£20, prefer wooden handel curved blade razor sharp , and with a locking feature for saftey, and i spose 1 that has "Bat Knife" engraved is out of the question, traverling is not a problem , prefer if in the croydon area, as i am still under 21 my dad will do the trans action