There is no conflict. He bought a building. That's all.
On the broader point of an implied conflict of fidelity by the employee; he's an employee not a medieval knight. Most businesses are set up by people who leave their jobs and set up in competition with their former employer. That's how the market improves. That's competition. It would be morally and ethically wrong to stop that from happening.
These laws are relatively recent. And employee
fidelity is a term that has been interpreted in the contemporary world whenever such cases are brought, as far as I have seen them. Employee fidelity is not like criminal conversation, conjugal rights or suchlike.
The manager who buys the premises seems to me to have become a
de facto partner in the business. In theory his employer may move the business to a new premises. But in practice this would be very disruptive to the customer base, would involve a new long-term lease and would probably be more expensive rent-wise. Dismissing the manager would also bring about serious disruption to the business - and would also require a premises move since the disgruntled ex-manager would be sure to make life as awkward as possible for his replacement.
I would expect that the eventual solution to this situation would be an agreement between the business owner and manager along the following lines:
1. The manager contributes the acquired premises to the business in exchange for the equivalent of £50,000 worth of shares in the business to be transferred to the name of the manager.
2. The manager becomes a director of the restructured business.
3. An agreement is made between the owner and manager of the business on a set of commercial and/or investment decisions, most of which the manager has proposed to the owner without success in foregoing years, which will be implemented over the following 5 years.
4. The manager's salary, bonus and eligibility to dividends are reviewed in line with his increased responsibilities.
I don't know the detail of what happened except that the manager eventually became the owner of that business.
As to what you are saying on many businesses being set up by ex-employees of a competitor, this is fine if:
1. No restraints of trade are written into the ex-employee contract. If there are, the ex-employee has to either work down the time lapse in another job (often nominal as most of his time will be taken up with preparing for launching his own business) or else seek an injunction in the court to reduce or remove the restraint if it is too onerous.
2. Nothing in the new business involves exploitation of information or technical advances gained during working for his ex-employer.
I know there are still people who work in say an auctioneering business and, when they are leaving that employ to set up on their own, see nothing wrong with telling certain clients of their soon-to-be ex-employer that they are leaving soon you know and would be happy to discuss the matter at hand at their new office on Main Street by the Holly Cafe . . .
Then there are
some retiring doctors, dentists, solicitors and accountants who "sell" their ex-clientele. I have seen ads in the Irish Times by a firm of solicitors offering to "buy" a "block" of clients from an accountant . . . So much for data confidentiality.