EF Ltd is an estate agent offering various property-related services. EF Ltd has lost substantial revenue after a large commercial client failed to pay for its professional services. EF Ltd has not been paid fees in respect of contracted estate management services from this commercial client. It has also not been paid the relevant fees for finding buyers for a number of the client's properties. Although not instructed to do so, EF Ltd has found buyers for this client many times in the past and received payment without question. This client claims to be withholding the estate management fees due to poor service by EF Ltd. The client is also withholding fees based on the fact that EF Ltd was not instructed to find buyers for their properties. (a) Identify, with justification, the legal issues arising from the client's failure to pay the estate management fees. (4) (b) Explain, with justification, the legal issues arising from EF Ltd finding buyers and not being paid the relevant fees.