Much of what you have said is quite wrong, there is no evidence that the poor have got poorer but rather the opposite. The average wage in this country hit it's highest on record this year at a time of the lowest unemployment rate so it is just an impossible argument to make. There is of course evidence that the rich have got richer but is that a surprise in a growing economy? The disparity between the two is growing though which is what I think you really mean.
Bar the disparity I don't really see the problem, we live in a free country where 'rich' people are the key to creating jobs and if they are richer there is a direct correlation between their growth in wealth and the poorest. Judging by the employment boom over the last few years I don't think you can say that trickle down economics is not working, I think you are trying to create an argument peddled by the likes of Corbyn which just does not support the facts. This is a man who will borrow billions at a time when inflation must be controlled against a devalued currency in the most economically dangerous time we have ever seen. Total lunacy but at least we will all end up on benefits to take our cut of it, I guess that is socialism.
The biggest threat to the poor is currently the ratio of wage growth to inflation, thankfully the latter has been stable but that is slowly changing. It is highly unlikely with a devalued pound and relatively more expensive import market that inflation will stay close to zero. That is the threat to the poor not to mention the vast majority of lower skilled jobs are in big import type companies such as supermarkets who are already being hit hard.
So on Wednesday I think we can expect him to announce as much for business as possible whilst the details of Brexit are unknown and it is vital he does so to protect the poorest who are employed by and directly rely on the strength of these companies.