Can you explain how that is different from the UK system where the UK unelected civil service drafts legislation in relation to political aims for the politicians to approve or disapprove."

Kenny B no comparison at all. In the EU it is the EU Commissioners who introduce the legislation and hand it down for the EU Parliament to discuss (Note: Discuss not approve) for the EU Parliament to do anything the decision made has got to have a two-thirds majority (Nigh on impossible in most cases - even when the entire Commission has been shown to be utterly corrupt - Remember the Delors resignations?).

Now in the UK all our political parties issue manifestos that tell us the great unwashed what they propose to do as and when they get elected to power. Provided they play fair and actually do what they say THE ELECTED MEMBERS OF GOVERNMENT assign the task of drafting the relevant Bill to the politically neutral Civil Service for introduction into Parliament when that Bill is debated, or "read", three times by both the House of Commons and the House of Lords, during this process changes can be made, then after it's third reading it is passed into law by majority vote when the Bill becomes an Act of Parliament.