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The Riba Subconsultant Professional Services Contract is not suitable for use if the client appoints direct advisors or specialists and is not suitable for ordering a leading designer as a subconsulter under the 2015 Design and Management Regulation. RibA recommends that the RIBA Principal Designer Professional Services Contract be used for these purposes. However, if the sub-advisor`s obligation was not agreed upon at the time of the appointment of the Senior Advisor, the client may be invited to give consent or has the right to refuse it. Since the client does not have a direct contractual relationship with the sub-advisor, he may also require a guarantee of guarantee in their favour, which allows him, if necessary, to assert a direct right against the sub-advisor and to have entry rights into the sub-counsel agreement in the event of the bankruptcy of the senior advisor. For the client, this hierarchical structure of the contract means that despite the services of a wide range of specialist advisors, he can retain a single point of responsibility. For the senior advisor, this may allow them to accept work that they have not been able to do fully themselves. The use of a subconsultant is acceptable, provided that the subseer is clearly identified in the shipment. The new 2020 edition of the RIBA Subconsultant Professional Services Contract has been fully updated to align with the revised riba worktop and has the same back-to-back conditions and constraints as the standard RIBA Professional Services Contracts. Therefore, if an architect or advisor wishes or may be asked to appoint a sub-advisor to provide part of the architect/advisor`s services, the Head Agreement is a standard RIBA Professional Services contract. If the main agreement is not a standard contract for RIBA`s professional services, the agreement of the architect/adviser for the sub-advisor is a capped responsibility. If the architect/advisor has not been able to negotiate this capped liability in the head agreement, this can be serious. The new 2020 edition of the RIBA Subconsultant Professional Services Contract has been updated to meet the revised RIBA`s work order. We also took the opportunity to review and revise some of the standard clauses, following feedback from contract users and construction lawyers, to make them clearer and more understandable.