Who, by the way, are the 'rich'? Am I rich; are you rich? What is the definition of 'rich' in the UK; I think the last Labour manifesto believed that an income of £80k pa meant one was 'rich' and presumably therefore to be obliged to pay for all those open-ended promises? Is that a combined income of £80k (presumably not as that could be made up of two basic-rate incomes which would still entitle the family in question to claim child benefit) or an individual's salary? Who knows, Mr Redshaw perhaps, or is it simply 'anyone who earns more than he does / did'?
Let us take a look at his statement about the current Tory cabinet. 'Make no mistake. Boris Johnson, Sajeed Javid, Liz Truss, Priti Patel, Dominic "Where is Dover?" Raab, these are all the swivel-eyed, small state, low tax, privatise everything, free market fruitcakes that might even have made Mrs Thatcher's hair stand on end'. Is this true? Where's the evidence? Of course they are to the right; that is because the nation overwhelmingly voted for a Tory government but that does not necessarily make them extremists; they just hold different views from him. The individual who appears to have most strongly held the views he ascribes to these individuals was, of course, a Socialist, at least in name, former chancellor and latterly PM, The Right Honourable Dr Gordon Brown.
I suspect that he is one of those reasonably comfortably off retirees with lots of time on his hands and probably nothing much better to do than write to newspapers and vent his spleen on fora like this. He is, as you say, rather boring but zealots usually are. They think they are contributing to debate but, in reality, they are simply proselytising.
BTW - note to Mr Redshaw: FDR died in April 1945; the Attlee Government was not elected until July 1945. FDR was a truly great man but his contribution to the post-war world was not made in the post-war world.
Final note - I, too, have plenty of time on my hands. I normally wouldn't bother with Mr Redshaw and his rants but I now have to fill my free-time with something other than Kindle and Netflix.
