Andy, you will pay a lot of extra tax. I worked a few Months a year for 3 years after taking my pension and got heavily taxed. If they also add the pension payment and wage together and its over 50k, you will go into the higher tax bracket.
I ended up paying more tax than some other employees actually earned. Since taking the state and private pensions, i have done odd jobs for friends but never for any business.
My private pension pot was over 500,000 so it wont run out and been drawing on it for 15 years so far. It pays more than the state pension but i still pay about 130 a Month tax.
Private pension, it is worth taking a higher amount in tax free lump sum and spending it all within about 5 years and you might pay no tax. I took the low amount not realising the tax i would now pay until i die. If i had taken the high amount and spent a lot of money, i would not be paying tax right now.
This was a good reason to buy a lot of National savings which have no tax on winnings. I usually win about 3k a year but maybe one day, a big win will come my way.
Brother had some good systems just hiding his money. Other Brother bought expensive cars and a small plane and caravan home at the airfield. They paid no tax at all. Best investment might be a large carrier bag under the bed and live it up