upvc porch repair

[rubble2]

I have included some pictures of our porch which was already in place when we moved in eight months ago.

As you can see, it appears to have been finished off with whatever bits of trim they had left on the van and the result is a bit of an eyesore.

I want to give it a makeover by replacing the trim pieces to hopefully a better standard than what is currently there, so where is the best place to buy small quantities of Upvc trim? there is a Eurocell branch not too far way, are they the best bet? or do they only deal with trade?

Secondly, what should I expect to find when I remove the existing trim? I can't really fathom out what purpose the trim is serving unless to cover up some pretty horrendous gaps where the frame fits - should I be scared?

I will be grateful for any hints or suggestions.

 

[foxhole]

Should be easy enough to replace with a wider trim scribed to fit as one instead of bits, the wider it is the less it looks like trim, more like part of the frame.