I am considering re-employment
Once you take your pension there is no reason why you cannot restart work with a new employer.
If you decide to carry on working this will not affect the pension that you are receiving. Your pension will continue at the same rate and will be paid in to your bank account as usual.
You should remember that your DMGT pension might be using up your personal tax allowance. You should therefore notify your local tax office as soon as possible of your change in employment status. They will then be able to deduct the correct tax from your different incomes.