Hello there,
I have placed my bid just in case if you don't find UK developer that will match your requirements.
IF you are interested please share more details about the project with me, so we can discuss further.
We are 1 hour difference with London time, I am located in Macedonia/Europe and we are in GMT+1 time zone.
Please check my Freelancer profile for more information.
As you can see there are most of my projects are Magento and there are a lot of happy clients,
I hope that will tell you enough about my experience with Magento.
Best Regards,
Bojan