No. It would go slightly north of county Cork.
A flight from Heathrow to Helsinki would fly northeast out of London and head over Norfolk and then it will spend some time over the North Sea, then the flight would cross the middle of Denmark the over Southern Sweden before reaching Finland.
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Out from heathrow turning south over the english channel over france coming over marsaille... then over baleric islands area algeria mali and into nigeria
none
8hr 25min Muscat (MCT) to London Heathrow (LHR) by a nonstop flight operated by Oman Air.
It takes nearly 12hrs to fly from London Heathrow to Mauritius
A flight from London Heathrow to Las Vegan McCarran Airport will turn north and fly towards Blackpool, then over the Isle of Man, then over the northern edge of Northern Ireland, then the plane will pass just south of Iceland and over the tip of Greenland, then the flight will finally head southwest over northern Canada, the northern states of the USA and into Las Vegas.
Direct GPS from EGLL (London Heathrow) to CYTZ (Toronto Center City) - Initial heading 299 (West - Across Atlantic Ocean - Across Nova Scotia - Into Toronto) Flight time at 500 kts - 6 hours
Most long distance flights try to keep close to a Great Circle route (to save fuel). Stretch a string or thread tightly on the surface of a globe and have it go through London and NYC and you have a great circle route. the path goes pretty fr north and follows the Canadian and New England coast before arriving at JFK.
Look at www.lhr.wwatc.com. The flight location is presented at real time. Head over the North Sea, Denmark, Sweden, Finland (North of Helsinki), Siberian Russia then south to Narita.
The flight path follows a Northeast direction.
A flight from Heathrow to Miami will fly southwest out of London and then fly towards Devon and Cornwall before leaving UK airspace, then the flight will fly over much of the Atlantic before reaching Florida.