Hi TheAeronaut,
With regards to Modular Training I would avoid CTC and OAA, and take a closer look at Flying Time Aviation, Stapleford Flight Centre and BCFT.
The reason I say this is because said FTO's will charge you the same, if not more for there Modular option than there Integrated;
I say also take a look at some FTO's outside of the UK, there are loads about.
Egnatia Aviation - Training College
Egnatia Aviation offer a 'Structured-Modular' program (Modular Stages, but using Integrated consistency and Airline focused training), all inclusive with accommodation for approximately £45,000. I haven't heard a negative thing about this FTO, and they use Bristol.GS for ATPL Theory aswell.
I hope this helps.