You CANNOT contribute to more than one cash ISA in the same tax year. I know it's only £1, but you have technically broken the rules and HMRC may give you a slap on the wrist.
You can, however, transfer the ISA to another provider and THEN pay into that new one. As Nemo said, you need to ask the provider for a transfer form rather than withdraw it as cash.
And btw, the limit is £5,340.
HMRC shouldn't give you a slap on the wrist (especially as contribution is so small), contributing to two cash ISA's in one year just means the most recent ISA will effectively lose it's ISA status. If you're doing things by the book you should notify your second cash ISA manager (i.e. the provider) that you have subscribed in error and they should arrange a refund of the money.