First, disclaimer, I am working on an US PayPal integration, not a UK PayPal integration, so there may be differences based on that.
Your question is a scenario that I am presently working on. That is, having BOTH direct credit card payment AND PayPal Express Checkout for purchase of subscription-based products (e.g., creating recurring payment profiles) with PayPal being the provider for the direct payment method (via either Payments Pro or Payflow).
There are limitations with Magento as far as recurring profiles are concerned. PayPal Payments Pro does integrate with Magento, however it is not a supported method for setting up recurring profiles in PayPal. You need to utilize Express Checkout.
There is a third-party extension -- "Subscriptions and Recurring Payments" -- available from AheadWorks that provides expanded functionality for recurring payments. The older version (1.9) does support the use of PayPal Payments Pro or Payflow Pro, but NOT Express Checkout. The newer version (2.0) supports the use of ONLY Express Checkout. So you get one or the other. Technically, it is feasible to run BOTH versions of SARP, but it is a hackneyed, server-intensive approach and not one that I would recommend.
If you want to do both Express Checkout -AND- direct credit card pay (via a PayPal product), you have to dive into the deep end of the pool and extend the existing PayPal module in Magento. (I know this, as I am currently in that deep end of the pool!)
Sorry this does not "solve" your problem. I've spent several months doing discovery work on this specific situation and the result was that I either:
a) Hack Magento's PayPal module to do what I want.
b) Create a custom module that extends Magento's PayPal module.
c) Create a standalone transaction API with a separate Magento module to interface to the API.