
There's a company called quickfit scaffold towers in Bradford/Shipley, they manufacture steel towers
They have a "diy" grade system where you can get a 4ft square tower with about 20ft working height for around £100+vat (excludes the boards)
I paid £100 for a 4ftsq /20ft high tower - well used, no feet or supports or boards - the ladder section stuff. I thought it was quite cheep. Should have asked on here!