At least 2 people i know were effectivly trapped in the ownership when it came to sell.
The company who owned the other part of the property had a minimum figure they would accept. The first of these was post ’08.
The second was just the company holding out for a very high offer (over market value); in the end she accepted the offer and paid the company the difference; meaning that for her 50% she took 40% of the sale price (or thereabouts).
With those type of horror stories + brexit uncertanty looming i’d be very wary.
Another friend of mine made a metric shit ton of cash, buying post 08, selling recently near Brixton market.