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Cheers, a close inspection suggests that the sealant is lifting a bit so will rake that out and replace at the weekend.
On the chimney breast, we had a damp "expert" (City Damp Proofing for those that are interested) that my girlfriend found to look at it.
Guy was a fucking cowboy as expected. Made a load of unnecessary holes with a damp meter, gave absolutely zero explanation as to why it may be damp and then, unsurprisingly, told us that the solution was a chemical damp proof course. All accompanied by some patronising "banter".
Obviously we won't be going with them which means we're still looking for someone to sort the damp if anyone has any suggestions for North London.
Have a look at the sealant around the outside edges of the window frame. Also, any frame fixing screws going down through the cill that don't have any sealant around the heads.
That's possible causes for below the window(s) but unlikely for the fireplace. Breaks in the pointing may be the culprit as you suspect.