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@FTP-FPS-Duck
Nothing can help anyone deal with road surfaces in North West London. Sorry.
That said, GP 5000 TL are pretty much the best tyres you can get nowadays in terms of low rolling resistance/comfort. Bicycle rolling resistance rates the marathon's tread at 14 vs 10 for the 5000 TL, and sidewall protection at 5 for the marathon vs 6 for the 5000 TL (higher is better).
In a nutshell, if you want tyres which are going to feel crazy more comfortable, 5000TL any day vs the marathon. If you want something that will be more hardwearing, keep with your marathons.
Let me know!