I have three different solutions I own (soon to own a forth). All have batteries as you use (integrated or separate), but the key for you is having radio transmitters for adjusting the light. I tried out the B2 and, frankly, hated it and thought it was overpriced. Some of these solution may not. E avail to you in the U.K. Other than by special order, but all are cheaper, and in my eye, better. These are:
Phottix Indra 500 with the Odin II radio
Elinchrom ELB400 (I use the HS head but there are two others) w/Skyport EL
Paul Buff Einstein 640 with a vagabond battery and Pocket Wizard TT1 or TT5
I also own a Priolte MBX500 HS and radio. Nice light but heavy and for my purposes, a bit slow for recycle. I have just ordered from Adorama the new Orlit 610 which can be purchased with a Canon or Nikon radio or use the native Canon RT transmitter. It also has an integrated battery, so no cables. Any of these I'd stack up against the Profoto and all, even the Elinchrom, are cheaper.