What about stepper online?
Some of their steppers / drives are available in uk.
I would get some of these myself:
https://www.omc-stepperonline.com/di...or-dm860t.html
This will cover you for both nema 23 & 34 size steppers.
My 860 drives are running my nema23 566oz motors sweet at 4A, 60V.
You could use a simple AC toroidal power unit on those ones too.
I put 3 in basket and came out at £142 for 3.

With motors you want a balance of the torque you require and the lowest induction possible.
Mine are 3mh inductance, the absolute highest I'd want. Hence why I put them on 60V. (3sqr rt * 32 = 55V)

I did start off with an ebay kit but dumped the motors pretty quickly so saved nothing going that route.
CNC4YOU shipping prices make you suck your teeth in.