The Archbishop of York, Dr John Sentamu, has encouraged people to "dig deep" in a lively video message in support of Holy Trinity's development plans.
In an appeal direct to the people of Hull and East Riding, he says the project to transform the 700-year-old church was vital if it was to serve the city in the years ahead.
Dr Sentamu has vowed to rededicate Holy Trinity as a Minster once the work is completed.
He says: "Every little helps - but for me I'm looking for big bucks!"
To watch his message and to see a video of the project's spectacular launch event, click here: