Understanding tax implications of making additional contributions to personal pension scheme

I would appreciate any insight on the following query. If I make a payment from my savings into a personal pension, the pension provider claims 20% tax from HMRC and pays this into my pension pot. If, for example, I transferred £30,000 to a pension, the pension provider would then claim £6,000 from HMRC and pay this into my pension pot. Are there any subsequent 'restrictions' or time limits before which withdrawals can be made from the increased pension pot?

Hi Stephen,
For pension scheme queries please contact us here:
Pension schemes
Thank you.