If you need that light on to see what your doing, buy a daylight balanced bulb, they are around ?10-13 on the net, this will also help with general lighting as well til you get the studio heads.
Head Wise, for you anticipated needs you don't need Bowens gear or Courtenay just yet, so for about ?300 you can buy a couple of portaflash heads, a couple of brollys, a couple of stands, a sync cable and if ya shop around maybe a softbox too.
The above + Softbox
?300
Basic setup, then once you need to upgrade you will already have the stands, brollys, sync leads etc and just replace as and when