Royal Air Force planes struck seven tanks on Friday, the MoD said, two in the Ajdabiya area and five around Misrata. The RAF is participating in the NATO alliance's enforcement of a United Nations no-fly zone over Libya.
The MoD said the RAF used Tornado GR4 combat aircraft, hitting the tanks with Brimstone anti-tank missiles and Paveway IV laser-guided bombs.
On Thursday, a NATO air strike hit rebel tanks west of Ajdabiya, killing two rebel fighters and two medics in the second friendly fire incident in a week. Britain has 20 fighter jets committed to the action to enforce the UN resolution aimed at protecting civilians from Libyan leader Moamer Kadhafi's forces.
Meanwhile Britain's guided missile destroyer Her Majesty's Ship Liverpool has taken over from the frigate HMS Cumberland in undertaking surveillance and embargo operations off the Libyan coast, the MoD said.
It will work alongside the minesweeper HMS Brocklesby.