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I would cut the existing surface very carefully using an angle grinder/ cut off saw, remove the Tarmac that is not to be used first. Then lay the edging on a sharp sand and cement mix haunching up at the same time with the same mix, this bed would be a minimum of 50-60mm deep and must be on a solid sub grade/ base. If using concrete blocks such as standard rectangular blocks or Tegula then I would butt them up to the newly cut edge, if using an irregular edge such as a cropped sandstone or granite sett then leave a joint and point up.
With a bit more info in terms of materials then we could give you a more specific spec.
Regards
John
Hi John,
Thank you very much for your input, that's appreciated and useful. Yes your point about cutting the tarmac edge cleanly is important - I wasn't sure quite how cleanly it would cut and therefore whether the edging (probably brick pavers laid in a double stretcher) would be able to sit tightly against the cut tarmac edge. But if there are irregularities, you think the edging could be joined to the tarmac with pointing then?
The foundation base will all be as you say (compacted hardcode etc) for the new area.
Alice
For the haunching I would use all in ballast in a 3:1 mix. You can use a Tarmac sealer but it isn't that necessary imho.