Thanks to Paul Bond of the Sailing Club. His notes have been worked into the coverage, the main gist of it is below:

"I have attached some notes including changes that I think will be of most use to visiting yachts.

The main update is probably that whilst the “Marina” pontoon is still in limited use, that Holyhead sailing club have laid a number of dedicated visitors moorings.

As noted in the attachment the major Marina Development in the Harbour has still not commenced,"

I reviewed these notes in September 2022. Gloom; it looks as though the marinas may not be replaced in the near future. This will draw a lot of North bound skippers to the Irish side from Milford - especially with the favourable tidal streams from Dublin to Belfast.

I reviewed these notes in August 2021. The references to the Marina have been edited to reflect the reduced state of the pontoons. The Yacht Club is taking up some of the slack but at the moment the Marina Landing Stage is managing with all their amenities as usual. I've added a paragraph on the Marina plans.

Good safe haven with basic offering . Hot welcome shower, laundry. Coffee and town for all your supplies.Good chandlery. (Closed Sunday) .Habour office closed Saturday and Sunday.Sound like promise of infrastructure improvements. But watch this space . We approached from the south. Good offing to the overall standard stuff going north about south and north stacks . However tidal info not that clear for Bardesy sound ! Stayed in Aberdaron bay (lovely spot)wanted to arrive Holyhead in day light . We did and pls so as a few submerged bouys on way to dock. Would not want to rely on fuel or gas. Water and power on short pontoon by white bridge.

Despite the marina owner's best efforts, there is still only a single pontoon (Breakwater 1), connected to land by a bridge.
Services ashore are still available, but office hours have been curtailed in light of the loss of berthing. It is still worth phoning if you are planning a trip to Holyhead (01407 764242) and Holyhead Sailing Club continues to be accommodating (01407 752526) with Visitors' moorings and a launch service during the season.

We have been reminded that Holyhead Sailing Club still has facilities for visiting boats and can provide visitors moorings as usual with a water taxi service. A point worth remembering if you do not need marina facilities in the future. At the moment you need to check availability in advance.

NEW 2018. There was horrendous damage here during March 2018. As far as we know the marina was pretty-well wrecked and we have no details of the plans for renewal of facilities. If you intend stopping here we advise you contact them well in advance to check on what is available (Though it is hoped that they will have the visitors pontoon up and running by June - albeit with reduced services).

I reviewed these notes in April 2017 (not before time either!) I've got the new prices in for this season, added a downloadable harbour plan and updated the charts.

The Club Website is on the following link: www.holyheadsailingclub.co.uk. The club launch runs April through October with varying times. All details are on the visitor information tab.
Our facebook page is www.facebook.com/hhsailingclub/

The notes for Holyhead were updated by Don T on the 22nd February 2013. The prices have been adjusted for the 2013 season. Note that the marina has held its 2011 prices for another year so probable increase in 2014. Little else has been changed except to endorse Tom Webbs experience (below) in the dark inside the harbour.