Hi mummyhodglim,
Create two sales invoices, one over £9899.64 and one over £200. You can mark them as paid on the invoice screen which will create bank account entries. Or after creating the invoices head to your bank account (within quickfile) and create to in entries over the same amounts and tag them to the before created invoices.
Then create a purchase invoice over £1812 and mark as paid which will also create a bank account entry. Or go to the bank account and create the out entry manually and tag it to the purchase invoice. Your bank account balance should show now the £8287.64
Hope this helps