OK ... Towergate did not win for me.
They came in £446 ( so more than £100 more)
The excess was £250 instead of my current £150
This was their on-line quote ... then I had a call this morning, they were adding discounts etc. ... and thought they could split the difference ... but still be at least £50 more.
Also 100% decider they would
not cover me for being towed on my SkySki, either personal accident not 3rd party injury or damage ........ also exclude towing multi person inflatables.
My EIS Sail Plan Policy gives me £1m cover and includes SkySki
They also would not cover the SkySki or any of the watersports kit for loss/theft ... skis, wakeboards etc. they advised I would have to claim, on my house policy.
Current policy covers them under £1000 personal effects .... all in all Towergate seemed very poor for watersports boaters.
It does include, theft, trailer & underwater leg strike. - incl 3rd party damage - I guess in case you hit a sub

Maybe just my circumstances - but their policy was a lot more expensive and a lot less cover.
So if any of you looking for good Marine cover ... you might like to try Porthcawl Insurance Services ......... they have been my broker for last 15 years - and as it seems to proves, they find me good cover at best rates.
They advertise in the back of the magazine .... web site is:
http://www.porthcawl-insurance.co.uk/So looks like my current insurer will get the renewal again.
FourWinns H210, Volvo 280-C-N duoprop, Monster MTK tower, SBS 2600 twin axle trailer
Tow Vehicle - Landrover Discovery Sport