Utilising digital for Registration & Amendments of Trusts

Hi possibly not in the correct part of the forum, but couldn't see anywhere else this fitted As part of our financial planning, we are setting up a Deed of Variation Trust which needed to be registered with HMRC. All well & good using the TRS online system, until we realise the wrong date had been used as the start date for the Trust. This needs to be changed, however I cannot see anyway of doing it using the on-line Trust management tools. Is there a way to do it?

Hi Smogmonster,
Please contact the TRUST HELPLINE 
Help and advice for trust tax queries.
Telephone: 0300 123 1072
Opening hours:
9.00am to 5.00pm Monday to Friday
Closed bank holidays (including Scottish bank holidays)
Overseas telephone: +44 300 123 1072
Their address is
HM Revenue & Customs
Trusts
BX9 1EL
Thank you.