//Regarding isolating,I didn't witness anyone being forced only requested with the possibility of a fine.//
It's a strange interpretation you have of "requested" and "forced". The only sanction for exceeding the speed limit is a fine. So do you suggest that drivers are "requested" not to exceed them, of "forced" not to do so? However, there's no real need to answer that because although you may not have witnessed it, the power to "force" is available. Have a look at The Health Protection (Coronavirus, Restrictions) (Self-Isolation) (England) Regulations 2020:
Enforcement
10.—(1) Where an authorised person considers that P is away from the place that they are self-isolating in contravention of regulation 2, the authorised person may—
(a)direct P to return to the place where they are self-isolating, or
(b)remove P to the place that they are self-isolating.
(2) An authorised person exercising the power in paragraph (1)(b) may use reasonable force, if necessary, in exercise of the power.
In the case of self-isolation (which you raised) the reasons they may leave home are very much more restrictive than the normal "stay-at-home" instructions that the whole of England are subject to and it is only permissible to leave home in a very small number of circumstances, And that confinement may have arise as a result of a malicious act to confound the track & tracing service or because a person just happened to be in the same premises as someone who tested positive (but may not necessarily have been anywhere near them).
You should not make such a trivial portrayal of these regulations. People are not being "kindly requested" to stay indoors as far as they can. They are being forced to do so.