Presumably if as the Times tries to keep suggesting with respect to the Michael Brown donation to the Lib Dems party members are somehow liable for their party's debts, Labour and Tory members are also liable in the last resort for their respective shares of £60 million.

So, even if the Brown donation is treated as something that needs repaying at some point the depth of pockets potentially needed by party members to pay off their debts are:

Labour: £23.4m amongst 200,000 members is £117 each
Conservative: £35m amongst 300,000 members is £117 each
and
Liberal Democrat: £1.1m debt plus, possibly, £2.4m Michael Brown donation, equals £3.5 million amongst 70,000 members is £50 each