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It means 'The other side are going to have to pay your costs, and how much you're entitled to will have to be assessed at a later date. But here's a proportion of your costs to be getting on with.'
General rule of thumb=
Payment on account: 50% of what you've actually spent
Total costs on the standard basis: 65-70% of what you've actually spent
Total costs on the indemnity basis: 80-90% of what you've actually spentI'd guess Jack's total costs bill is in the order of £200k, and she'll probably get back another £20-30k on top of the £107k she's already been awarded.
Also, could someone perhaps explain what 'costs on account' means? I've tried searching the Internet and it seems like too much work. :)