Repair join of tarmac and concrete

[Krikkit]

The tarmac edges on our driveway (which is poured concrete) to the street are starting to crack/crumble and making the pavement etc look a right state, I think it'd be curable with some kind of sealant etc but I'm not sure what I'm looking for. Any suggestions? I've tried the usual suspects and haven't found anything obviously correct.

The cracks/edges are small enough that they will fill with some poured/semi-liquid product, but it needs to be hard enough to cope with being driven over on the hottest days without melting.

The only thing I've found so far is this, but as with everything B&Q it seems a bit steep; http://www.diy.com/departments/tarmac-ready-to-use...

Suggestions welcome.

Edited by Krikkit on Monday 24th July 11:08