"SAINSBURYS STOP LOCAL SHOP FROM OPENING"

In an earlier post I spoke about the behaviour of Tesco's in the Kent area and how they have been buying up empty high street shops round the county then not allowing people to rent them for the purpose of opening up their own shops as a way to capture all trade and squeeze out competition.
This has led to a scandal in the now desolate Kentish high streets where the residents feel that their community has come under sustained attack from the supermarket giant who are acting in an incredibly greedy immoral way just to grab as many customers as possible.
Now, it appears that Sainsburys have been doing the same thing.
On the corner of Ladbroke grove, Harrow road and Kilburn lane lies an empty shop with white washed windows, a short time ago the empty shop was being renovated so that it could be opened as an independent business, all was going well at first, the builders were in, and the plans were going well. That was until Sainsbury's swooped in and forbade the shop to open ( I do not know the exact details about how they managed this, maybe they own the building).
This moral travesty was brought to light by one quick witted person who had the right idea when he wrote into the white washed window "Sainsburys won't let him (the would be shop keeper) open his shop". Normally I would of dismissed this as sour grapes, or the product of a fertile mind, but knowing what is going down in Kent and the detrimental effect it has had on the 'Kentish' community I have serious doubts this is made up, after all if it wasn't for me having quite a few relatives who live in Kent I would never have known about the situation. It hasn't, for some reason made it into the media, but I know my relatives sources are straight, honest people who have nothing to gain by making this sort of thing up.
So, is Sainsburys actively stopping people in the general area from opening up their own shops as much as they can? I am inclined to believe they are. Rumour has it that they are one of the biggest critics of scrapping the western extension of the 'C' charge because they know that people with cars would happily once again return to shopping in Portobello market and give Sainsburys the brush off in terms of fresh fruit, veg and other sundry items like bread from that great bread stall that's out Fridays and Saturdays. Plus, it is typically aggressive conglomerate behaviour.
Has anyone else heard of a major supermarket chain buying up local stores only to shut them down and not let them be reused as shops?
If you have heard of this please let me know, ta.