I found this, I think it's quite reliable, included the A330 too. A Friday day return to TFS from Gatwick on both the A330 and 757 seemed pretty good to me, sure it was only about £130.
LGW 1 x A332/2 x B757
Monday
A332 - AM - CFU
B757 AM - DLM/FAO PM - PMI/VRN/DLM
Tuesday
A332 - AM - SSH –
B757 AM - KVA/CHQ
Wednesday
A332 - AM - TAB –
B757 -AM - PMI/RHO PM - DLM/LCA
Thursday
A332 - AM - SFB –
B757 AM - ALC/ZTH PM - FAO/DLM
Friday
A332 - AM - TFS PM - DLM
B757 AM - BCN/VOL PM - TFS/CFU
Saturday
A332 - AM - SFB –
B757 AM - MJT/DLM PM - DLM/PMI/ALC
Sunday
A332 - AM - PVK PM - FAO
B757 AM - PVK x 2 PM - PMI/DBV
MAN 1 x A332/1 x B757
Monday
A332 - AM - CFU –
B757- AM - DLM PM - DLM
Tuesday
A332 - AM - TFS PM - TFS –
B757 - AM – CHQ PM - HER
Wednesday
A332 - AM - SFB –
B757 - AM - RHO PM - DLM
Thursday
A332 - AM - SSH –
B757 - AM - ZTH PM - ZTH
Friday
A332 - AM - SFB –
B757 - AM - JSI PM - PMI
Saturday
A332 - AM - PMI PM - SSH –
B757 - AM - MJT PM - PMI x 2
Sunday
A332 - AM - PMI PM - TFS –
B757 - AM – VRN PM - SSH