It's worth massively more than that £250 for everything as a "job lot". Well over £1000.
You could spilt the items, guide prices (off the top of my head):
Lathe with 3-jaw and change gears = £350-£400 (you see some pristine lathes – they can go for £600 easily)
Milling attachment = £300
4 jaw chuck = £80
Milling table £50
Milling vice = £50-£75
Collet chuck and collets = £150-£200
Steadies = £50-£100
Just list the items separately on the well known auction site. Start everything at £1 and you'll get a fair, current price for everything as Emco items are extremely popular.
Hope that helps. Feel free to ask any Qs via PM if you want advice on any items.
Mike
EDIT: If going down the eBay route – clean everything up best you can, take lots of photos and wait for their frequent £1 max selling fee promotions. Obviously these promotions limit the final value fees to £1, which makes a huge difference when selling items of fairly high value.
Edited By Mike Clarke on 05/09/2019 13:48:45
Edited By Mike Clarke on 05/09/2019 13:54:15