Website at
http://www.tenantloanscs.co.uk/. Contact us page provides 0800 number for sales - 0871 number for customer services.
WHOIS data reveals it is run by a company called "Post Net Ltd", which may be associated with "J E Beale plc", at the following address:
21 Richmond Hill, BOURNEMOUTH, BH2 6BJ
192.com reveals a lot of companies based at that post code - of which "Beales head office (Beale plc)" is - their contact number is 01202 203484.
Further searching suggests that "Post Net" has some association with "James Benamor", whose contact number (revealed by a WHOIS for "tenantloansonline.com" is 01202 629100.
I think this Yahoo! Answers question reveals that this whole operation is a scam -
http://uk.answers.yahoo.com/question/index?qid=20071010172917AA5xFE0