http://www.amazon.co.uk/gp/product/B000J34HN4?keywords=casio&qid=1444774531&ref_=sr_1 _1&sr=8-1
this al qaeda endorsed classic could last you decades upon decades and is reviewed as being better quality and more durable than 90% of more expensive alternatives. in fact it's been called perhaps the single best electronic item you can purchase because of how fucking well made it is and how it just works and doesn't break.
£6.99 - life supply of wrist based time action sorted