I get Mr Khan is the host, mr Thomas is the receptionist, and Mr Rowntre is the security guard
1. Mr Khan is not the security guard as he can beat him at ping pong
2. Mrs Thomas's salary does not divide exactly by 3, therefore she is not the nearest neighbour to the receptionist and therefore either lives in Liverpool or Shenly (not halfway)
Mrs Rowntree lives in Liverpool, therefore Mrs Thomas lives in Shenley.
The receptionists, namesake lives in Shenley
Therefore Mr Thomas is the receptionist
3. As we know that Mr Thomas is the receptionist and Mr Khan beat the security guard at ping pong it means that Mr Khan must be the host and Mr Rowntree must be the security guard.
Mr Khan is the host