Recommendations for swimming lessons for adults?

Hi all 

I've decided to finally learning how to swim properly. Do you have classes / trainers for adults to recommend?

Just didn't want to get stuck in an online maze of Better websites, so thought I'd ask for your suggestions based on experience. 

Anywhere within easy cycling / commuting / driving distance of Harringay works, and I'm open to group sessions as well as 1:1. 

Many thanks!

S