SPB: What the tories fail to (publicly) mention is that the scheme would be funded by UK Shared Prosperity Funding (so called levelling up),

According to (Home Secretary) James Cleverly:
Mr Cleverly insisted the plan was "fully funded", with £1.5bn diverted from levelling up's UK Shared Prosperity Fund from 2028. A further £1bn would come from a crackdown on tax avoidance and evasion, the Tories say. from BBC News

The fact that you may not have heard/read about official statements is no evidence that they haven't been made.