Cryptic
Across
8 Italian port British in row with, being less than half Italian originally (8)
9 Tartans sound right for these nationals (6)
10 Fruit first picked from upper groves, Long Island (4)
11 Precocious kid's hot stuff here on the Danube (10)
12 Down in Maine, too? (6)
13 Beatific lady is accommodating to Napoleon in the end, perhaps (6)
15 Resettles her, etc, moving to Durham town (7-2-6)
18 Pass sheep coming back to a site in Alsace (6)
20 Head into a morning set-back in a Brazilian city (6)
23 German springs into a doubledegree study... (5-5)
24 ...of madrigals, in part, here on the Baltic... (4)
25 ...Sea – roughly south, within Kiel’s boundaries, going around the German city... (6)
26 ...collecting a second first-class return, with odd lines about one of the Polish-German marches (8)

Down
1 Old and young gather round chart after gold in mountains described (9)
2 Chinese city quarter one finds no good, following article (6)
3 City of Aotearoa is created with granite-edged coating (8)
4 State in India of New Hampshire lad without China tea (8,7)
5 Canadian university measure, understating a British award (6)
6 German royal line, in lager circles (8)
7 Indian destroyer taken out of British invasion without quarter (5)
14 Rip Penang apart finding French community (9)
16 Poles capture digger before snow transport detail reaches Russian city (8)
17 Solemn, ie, sad, these folk had to leave Florida (8)
19 Cell-phone centre in Alabama (6)
21 Prophet the Church put first after rabbi (6)
22 No 3rd dan karate characters found in W African city (5)

Quick
Across
8 Italian Adriatic port (8)
9 Bohemians, eg (6)
10 Cross between a grapefruit, Seville orange and a tangerine (4)
11 Capital of Slovakia (10)
12 Towns in N Wales, N Ireland and Maine (6)
13 St ------, British dependency in the S Atlantic (6)
15 Town in Durham, England, on the R Wear (7-2-6)
18 Capital of the Haut Rhin department, Alsace (6)
20 Mining and forestry city of Brazil, NW of Belem (6)
23 German spa town (5-5)
24 Baltic capital (4)
25 Former Westphalian capital, in Hesse (6)
26 Of the Polish region, once Prussian (8)

Down
1 Study of mountains (9)
2 City on the Yangtse, on the tunnelled railway between Hefei and Jiujiang (6)
3 City and Region of N Island, New Zealand/Aotearoa (8)
4 Mountainous Indian state, south of Kashmir, capital Simla (8,7)
5 University based in Montreal, Canada (6)
6 One from the capital of the Brandenburg Hohenzollerns (8)
7 Hindu god, destroyer and reproducer (5)
14 Capital of the old French province of Roussillon (9)
16 W Russian city, often sacked because of its strategic position (8)
17 Native Americans originally from Georgia and Florida (8)
19 Alabaman Gulf port (6)
21 Name given to a prophet, from the Greek to anoint (6)
22 Capital of Senegal (5)

Big Bad World by P J Polyp