I often use Dive Time, an offshore 125, huge deck space, plenty of room for kitting up and storage, room for all divers onboard in the wheel house, fridge and microwave on board. Dive Time is equipped with all modern navigational aids, carries oxygen, has plenty of space for changing and has a toilet onboard. It also has a lift so getting back on board, even with twinsets and stages is easy.
The skipper, Paul, is very knowledgeable and friendly and always has an additional crew memeber on board.
The website is
http://www.divetime.info/ but it's being revised at the moment.