Imported post
I was in Malta in May this year. Should still be a trip report around here somewhere if you have a search. The diving is excellent, I'm sure you'll really enjoy it, particuarly if you've only dived the UK before
I tried to do Malta, Gozo and Comino as there are good dive sites on all. There are far more dive sites on Malta than the other two islands. Only managed Malta and Gozo due to not getting booked on Comino trip early enough.
As someone else mentioned it's mainly shore based. The rocks are rough and so I'd strongly recommend thick healed boots. The water was around 18c (surface) in May and I think it will be similar or slightly less in November. You might want to consider your drysuit with minimal undersuit. A number of divers had them on when I was there. I wore a 5mm wetsuit with a 3mm shortie on top. I'd also recommend gloves to protect your hands when exiting the water, you can get push around a little when there's a surge and the rocks are pretty jagged.
In terms of dive guides I used Subway Scuba in Buggiba (they have several offices around the island). They were really good and very competitive on price. Subway and Maltaqua are the longest running dive outfits on the Island, both are usually highly recommended.
The book I got was Maltease Diving by Ned Middleton which I found an excellent book. Good picture of each site, plus detailed description of what you can expect to see.
My best dives were HMS Maori - Valette/Msida Harbour, Wied iz Zurrick (spelling ??) and the Inland Sea - Gozo. Dives I would have liked to do but didn't have qualification/time for...El Faroud, Tug Boat Rozi, Blue Hole - Gozo and Comino Reef. Worst dive I did was the Carolitte Barge in Msida harbour, crap visability with minimal marine life. Imagine if they sunk a canal boat in Stoney Cove.....yep that's it.
I'd definitly go back to Malta again to dive my favourties again and get the ones I missed.
Hope this helps...