Relaid patio now above some vents, water pooling... what to do?

[TimD]

Recently had a decaying bit of back patio behind our 1890s Edinburgh tenement taken up and relaid.  Apparently there wasn't much under it before and by the time the guy (recommended by some gardeners we use) had put down a base he was happy to put it all back on, the whole thing was an inch or two higher than it had been before.

 

Unfortunately that means there's now a dip around a couple of low vents in the back wall.  One of them (on the right in the photos) is from the bathroom extractor (it runs down and under the kitchen floor behind this wall); I've no idea what the other one is.  I noticed the dip had collected pooled water earlier this morning from heavy rain last night, although it had all disappeared (I hate to think where!) by the time I got round to taking the attached photos a few hours later.  (The spirit level in the second photo is just something to make it easier to see how deep it is.)

 

Any thoughts on how to deal with this?  My first idea is to put some sort of little "hut" over it (with enough louvre to allow the vents to still vent) and make sure it's sealed enough around the sides to not allow water to flow in under it or down the walls.  Open to other suggestions though.  (And my Google-fu is not having much luck finding where I could buy such a thing ready made if they exist... just endless meter boxes and simple vent covers).

 

Thanks for any ideas

[Mr Punter]

The patio is too high.  Raising it has made it even worse and he should have known better.  The wall looks very damp.  Could you form a channel next to the wall around 120mm wide x 150mm deep to act as a French drain?

[Redbeard]

1 hour ago, Mr Punter said:

Could you form a channel next to the wall around 120mm wide x 150mm deep to act as a French drain?

...and is there somewhere for the water collected by the French Drain to go? A main drain? I'm guessing a soakaway would be too close to the building (?), though I have no idea of Scottish regs.