Torts (Interference with Goods) Act 1977
UK law stated here is similar to that stated above at Citizens Advice web sitehttp://www.surreycc.gov.uk/__data/assets/pdf_file/0011/173675/Disposal-Of-Uncollected-Goods.pdf
Note minimum of 3 months must elapse after written notice has been sent to owner at the last known address
You can not scrap the goods or give them away.
you must try and raise some money, deduct repair costs, cost of selling etc and subtract from money raised
if any money left over keep for a maximum of 6 years before it is yours
There is UK specific legislation covering goods left on Public Transport or found in the street.