Yes, exdc has it on the button. S5 has a maximum sentence of a fine of £1,000. (The levels of fines on the "standard scale" are currently (L1) £100; (L2) £500; (L3) £1,000; (L4) £2,500; (L5) £5,000.
Accordingly the only penalties available to the court are an Absolute Discharge, a Conditional Discharge or a fine of up to £1,000.
In reality it is most unlikely that you would receive the maximum fine. For a start, if you plead guilt at the earliest opportunity you must, by law, be granted a reduction of one third. Additionally the fine must be based on your means and magistrates rarely impose a fine of more than one and a half times your net weekly income.