hi there ..
Im also in the uk and ive learnt everything i know from this forum the peolple are really helpful and know everything you need to know...so here goes , il tell you what i have as my basic setup and i hope it helps ...
I have a 3ft * 18" * 18*...
my substrate is walnut sand (I know some people advise against any sands ) but i have had no problems with this and my beardie is one now... Cost around £5 per kilo and i have 4 kilos in my viv..
my basking light is a Reptiluxe 40w white basking bulb.... Cost around £4.50
my UVB is a tube type Reptisun 10.0... Cost around £39 ( DONT go near any of the curly type compact UVB they are really no good for your dragon ,, Believe me i have learnt this the hard way ). You also need the starter unit for the tube ..Cost around £40..
I have a heat mat (taped to the side and only for cold nights or winter use ) Cost around £20..
............... hope this helps .............