Q: I am a Brit living in Germany. I really need to be able to purchase from the German iTunes Store (in €) and the English one (in £). How can I set this up from my iPad?

If you are in Germany then you can only buy content from the German iTunes store - you will need to be in the UK with a UK billing address and payment method on your account to be able to buy from the UK store. If there are items in the UK store that aren't in the German store that you would like to buy then you can try requesting that they be added to the German store, but ultimately it's the content provider (record company, film studio etc) that will have to grant Apple a license to sell them there : http://www.apple.com/feedback/itunes.html

Technically correct (the best kind of correct)

Now if the Op has and retains a UK account with billing address and UK paymant card - He/She can continue to use the UK store in Germany - Apple does NOT use IP address blocking just a valid paymant card attached to a postcode !

Basically the first four of your paymant card are country codes.

What the op needs to do if he/she now has a Germany address and payment method (could just be German € value gift cards) is to open a separate German iTunes Account !

On a PC/Mac its very easy to change stores, however iOS has it a bit more difficult.

In fact i would recommend the Op sets up a new German account and credentials on a PC/Mac first.

And doing so just means opening the store in iTunes scrolling to the bottom of the screen and clicking on the littler circular flag in the bottom right.

After that the browser window is populated with loads of similar disc flags. Clicking any take you to that regional store where provided you have a valid address (Postcode/Zipcode actually) and payment method local credit/debit some prepayment VISA cards or just a gift card you can create a local account.

Oh and because Apple do NOT use IP addressing you don't actually have to be present in the country of that store. Its against to terms of the EULA but it works !

Back to the iOS device

Tap Settings/iTunes & App Store /Apple ID (that will probably be showing the UK account set up).

In the window that opens tap log out

Now  change the ID to the new German name and password and in the next window make sure the flag selected is that of Germany (when in Germany)

When buying from the UK store follow that path again log out of the German account and re-log in using the UK ID

As it happens I have a UK Portuguese and US account all active because I have residences in all three - and can visit any of the stores from anywhere.

You can set up and use a UK account when you are here in the UK.

Creating an account : http://support.apple.com/kb/HT2731

Creating an account withoug giving credit card details : http://support.apple.com/kb/HT2534

A UK account will use £s, and iTunes gift cards are country-specific e.g. you will only be able to redeem UK iTunes cards (which will be in £s) onto a UK iTunes account.

Note that using iTunes Match, automatic downloads or re-downloading an account's past purchases may tie the computer or device to that account for 90 days (but if you keep a copy of all of your downloads then you shouldn't need to re-download) : http://support.apple.com/kb/HT4627