Just received this from HHA, posted here for those that don't subscribe to Harwich NTMs.

Mariners are advised that on or about Monday 26th February 2018 works will commence to remove the walkway between the Ha’penny Pier and the pontoons for essential repairs.

Therefore, there will be no access to the pontoons from Ha’penny Pier – and no alternative arrangements will be made. The ramp is due to be returned during the week beginning 12th March 2018.
All mariners are advised to navigate with caution in the vicinity of the works and must proceed at the minimum speed possible conducive with safe navigation.