Client A requests a valuation of property XYZ and is looking at purchasing at auction. Client B approaches several days later asking for a valuation as well: $1-$ can you accept the instruction from client A$?2-$ if the property didn't sell at auction and client C wanted a valuation, can you accept? $3-12$ moths later Client D requests a valuation. You explain you need clearance from Client A before you can proceed. Client A objects. Are they being unreasonable, can you proceed?