The 4in longer bed and slightly more powerful motor may be worth the extra £100 even though most work will be under 2 inches long it makes things a little easier to set up.
As said on another thread BEGINNERS DON'T NEED A QCTP, there are more important things to buy.
If you have the money for a WM180 and a QCTP then you have the money for a WM240 which is worth far more than having the QCTP and it has a vertical slide and eventually a QCTP available.
If you have the money now for a WM240 and a QCTP then get the WM250 and so on. Always sink the max into the lathe to start with as it is easy to get extras later but a real hassle to change up the lathe.