Big old machines are worth very little because 1) There are a lot of them on the market, 2) They need space not many people have so are not desirable by Diy people.
I would suggest that if a dealer offers £900 for the lot i would bite his arm off.
I am in a similar position with father in laws lathe, a 1943 Mitchell Junior, 2 1/2 tons of cast iron 9ft long.
In reality such old machines are worth little more than the current price of heavy iron approx £200 per ton.
So Father in laws lathe might fetch £500 in scrap, for that it will need a days work for a couple of strong men to get it to where a hiab lorry can pick it up then take it to the scrap yard. Fairly slim pickings once everyone gets paid.
You could try putting them on,
www.homeworkshop.org, its a good site for selling machines & its free.