Get yourself a suspension seatpost. I ride to work along a towpath with cobbled sections. Low pressure in 38c tyres wasn't doing much so I got a Suntour NCX seatpost and my back hurts way less now. I've still gotta wear gloves though or the vibrations make my hands numb.
I now ride a gravel bike with 40mm tyres filled with slime. I was getting punctures riding on the cycle lane as it is so cut up.
'developed for aspiring riders looking to elevate their experience on the road ' Pot holes feel so much better on an expensive bike. Seriously, I've packed in road biking because the risk factor has increased significantly. Not just drivers watching everything except whats going on around them but the state of the roads...... Take care out there folks!
Ah OK, that's a shame. Still a good price :)
£25 postage making it £400. Doesn't appear to be a collection option if local to the area.