instalment noticemeans a notice given by a ratepayer to the Secretary of State under paragraph (1B). 1B Paragraphs (1C) to (1H) apply where a ratepayer gives notice in writing to the Secretary of State that they wish to pay the estimate of the amount payable for each chargeable financial year by 12 monthly instalments until further notice. 1C An instalment notice may be given either before or after a demand notice is issued and may specify that it is to take effect starting in relation to the relevant year or the year following the relevant year. 1D Where an instalment notice relates to the relevant year, a demand notice to which regulation 6(1) applies shall be issued as soon as reasonab