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If you're doing a purchase, its on there as an estimate of what the solicitors might charge for the work. This should be accounted for already in your solicitors bill.
For remortgages, the lender will typically either: give you cashback of £250/350/500 so that you can nominate your own solicitors (and they may estimate a figure for conveyancing in the offer or illustration) or offer free legal work (though with supplementary costs if it is not a super straightforward remortgage, freeholder notifications etc etc)
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