MIR 4.10.6

A Recognised Clearing House must, for the purposes of managing its credit and the requirements in Rules 4.10.7 and 4.10.8:

(a) mark participant positions to market and collect variation margin at least daily to limit the build-up of current exposures;
(b) have necessary authority and operational capacity to make intra-day margin calls and payments, both scheduled and unscheduled, to participants; and
(c) regularly review and validate its margin system to ensure that it operates effectively and as intended.