Hi Jakov, I am thinking of spending some time in the Split region anyway so possibly we could return to London from Split but fly into Dubrovnik at the beginning. How long from Split by bus?
29th July to 16th August are my dates.
What lot of people do is to fly to Dubrovnik and then take ferries via islands (Mljet,Korcula,Hvar) to Split.
Ferries from Dubrovnik to Islands are not expensive (30-50 Kuna per person) so that can be good option.
Travelling by bus is also interesting as you can see coastline.
Most of buses has air-conditioning so you shoud be ok as far as temperature is concerned.
Your dates are pretty buzy, very high season..