Engineering craftsmen/technicians usually get into the industry via a 4 or 3 year apprenticeship at the start of which you'll be payed between about £100 and £250 per week. This will rise each year of your apprenticeship until you finish it at which case you should usually be payed qualified rates of pay. Most jobs within engineering should pay between £20-40k per year depending on qualifications, experience, area of expertise etc. Those working in leadership and management positions could make between 40-80k per year. Those working in specialized industries or fields of work, dangerous or unpleasant conditions or trades that are currently suffering a skills shortages (such as offshore workers, commercial divers, welders within the petrochemical/oil industry) could earn up to and above £100k per year.
Graduate engineers will typically start on between 20-30k per year. With several years experience that could rise to 30-40k. Senior engineers and project managers could earn up and above £100k. Specialised, dangerous, unpleasent and difficult to recruit work again will often fetch the highest wages.
As you can see these are very general estimates. There's thousands of engineering firms out there all with different pay rates.