Likely more than it's worth. In many cases, even moving a mass produced piano will cost more than it's worth. To keep it in good nick even in climate controlled storage it will want tuning annually. Depending on your location, you could be looking at £600-£1200 to keep something worth £300.
Can you buy playable, tunable 2nd hand pianos for £300? I thought the ones that are sold cheaply are no longer properly tunable. (I have no idea about the market, just remember reading that somewhere.)
Likely more than it's worth. In many cases, even moving a mass produced piano will cost more than it's worth. To keep it in good nick even in climate controlled storage it will want tuning annually. Depending on your location, you could be looking at £600-£1200 to keep something worth £300.