HSL
I do understand because I have been there, done that & got the T Shirt.
1 The max duty period after 2200 local is 10hr 15 min., not 10.25.
2 I have checked the duty periods to Tenerife that I operate to. They are reasonable but not fat, allow 1 hr pre-flight & 1 hr. turn-round, operated at M0.80.
GLA 11.15
NCL 10.45
MAN 10.30
BHX 10.20
STN 10.15
LGW 10.15
From the above it can be seen that it is possible to operate to TFS from only LGW and STN during the night (Also BRS & CWL) however there are no flights rostered after 2200 because only a small delay would take the flight into discretion. If you have a scheduled flight from GLA or NCL that departs after 2200z it is plainly illegal.
If my memory serves me correctly the SRG require a minimum percentage of a particular flight to operate within the maximum allowable duty period otherwise the schedule is deemed unreasonable.
At the end of the day it is up to you. If you are fit and not likely to suffer from fatigue, you may use your discretion, however as CAP371 Section A 1.3 states "if you have reason to believe that you are likely to suffer whilst flying from such fatigue as MAY endanger the safety of the aircraft or of its occupants"
you must not do it. and neither will you company ask you to do it.
As Chirp recently suggested if you are being put under pressure, ask for a fax to confirm their requirement for you to operate. He won't send it. Any threat is strictly verbal.
One suggestion. If you are delayed ex UK and it looks like you are going to exceed the maximum FTL tell your crewing department that you are unlikely to be able to use your discretion and could they please organise hotel accommodation in TFS.