I think VIPA VLF is the best product (stand to be corrected by those with better info) but it is a bit riskier because it is a mutual style of fund and is still fairly new. Also it is only available to Virgin Group pilots, I think.
Also, Comminusure is not a loss of licence insurance, it is income protection which is different. Loss of licence typically pays out a lump sum, which may or may not be taxable, whereas Income protection pays a percentage income for a defined period. Not sure about the tax implications, but I'm guessing it is taxed at the same rate as income.