Once upon a time I also took my ADR and never used it.
The jobs are hard to come by and the pay is not as it was, the majority of the work is now done by outside contractors the chance of being employed directly by one of the big fuel companies I would guess is next to zero.
General haulage or any type of work where the vehicle is the sole income of the business is a mugs game unless the work is specialized, the only gainful employment worth doing is own account and directly employed by the company Asda Tesco for example.
The terms and conditions are still quite good you have guaranteed hours and everything is paid for like training uniform liceneces CPC and so on and all the time in work is paid by an hourly rate, the pace of work is leisurely and if you want the hours you work them if not you go home, unlike the for profit circus where £120 per day sounds ok you will work a minimum of 12 hrs per day.