An important note when dealing with UK equities. UK equities are quoted in pence as opposed to GBP. If a share is traded at a price of 1000 pence the value 1000 should be given for Price and if the CashAmount is given the amount should also be provided in pence and not GBP.
If no CashAmount is provided the value of the order will be calculated using the following formula: NumberOfUnits * Price / Multiplier.
The Multiplier is set on the financial instrument and for a UK equity the Multiplier will typically be set to 0.01.