Across
1 breakfast FAST by BREAK
6,2 full English FULL (sated) + E(nglish) [satede]
8 foxglove (bloomin)G in FOX LOVE
9 toasty double def
10,24 serial killer cereal killer (hom)
11 train set RAIN in TEST (rev)
12 Warhol WAR HOL(e)
15 carillon CAR/ILL/ON
16 porridge double/cryptic def
19 Mister missed a (hom)
22 pouffe P<O(ld)UFFE(r)
25 Slovakia OVA/K(ippers) in AILS (rev)
26 onus (b)ONUS
27 discovery DISCO + VERY
Down
1 booze boos (hom)
3 knoll hilL ON Kos (hidden rev)
4 aseptic A/SE<P(ocke)T/I>C(ond)
5 tetragram (coa)T in MARGARET (rev)
6 flannel double def
7 lithesome ITEM HOLES (anag)
13 adoration A/DO<RATIO>N
14 Lady In Red AND DIRELY (anag) [Chris de Burgh]
17 riddles RI<D(aughter)/D(aughter)>LES
18 Ephesus (n)EPHE(w)/S(outh)/US
20,21 sausage sandwich BRE<BAN/GER>AD [banger in bread]
22 photo P<HOT>O
23fairyFAIR + (hol)Y