Hello and welcome to the site. Thank you for your question.
If you wish to withdrawn your full pension pot in Apr 2015, you would be taxed on
(250,000 x 75%) £187,500 as the first 25% would be tax free
As your income would be in excess of £100,000 you would lose personal allowance and your tax would be
31,785 x 20% = £6,375
118,215 x 40% = £47,286
37,500 x 45% = £16,875
Total tax payable = £70,536
Net amount received (250,000-70,536) = £179,464
I hope this is helpful and answers your question.
If you have any other questions, please ask me before you rate my service – I’ll be happy to respond.