I don't think for a minute that the LP is out to get pensioners. Maybe they don't see pensioners as a protected group, though. The Tories did, as they got voted from pensioners, but realistically, there is no reason why subsidies should be given to one group and not others with the same income.
The pension should rise, as should benefits for those who can't work, and IMO those who could work but choose not to should also have to pay into the system (with safeguard in place). As things are, there are too few contributors for the number of recipients of all ages. The SP in itself is not enough to live on, which is not right, but as long as working age people can opt out of making financial contributions to society there will not be enough to increase it.
Until that happens, those (of all ages) with savings and incomes will have to carry the burden. It's not fair, but means-testing isn't fair. The trouble is that the alternative is to have people going cold and hungry if they haven't provided for themselves, and who wants to see that?
Everyone should be able to pay in, so wages need to rise so that people can survive with enough left over to pay taxes, even if they are relatively low. Minimum wage is not enough to live on either as rents are so high, so wages need to rise, and rents need to be controlled. I hope this is something that is in the budget. Yes, it will mean that those who have paid low wages and those who charge high rents will lose out, but there is no reason why anyone should get rich because taxpayers money subsidises their profits.
Ensuring that everyone contributes will mean that everyone has a stake in society, which might improve morale and cut down on the sort of disaffection that led to the riots.
My hope is that this is the sort of thing that Starmer is planning. Not by taxing working people more, but ensuring that they are not carrying too much of the burden of the welfare state. With that in place, there should be enough to pay a decent pension so that pensioners don't need extra payments.