I did my core course with Alpha, Fleming Way , Gatwick , a couple of years ago.
They contracted in a couple of instructors for us . I think the course was advertised at £3500 and we got it for £2500 .
The Sim was a 737-800 but used as a generic sim.
No complaints - instructors were very good and experienced . Just two of us on the course . Very thorough.
Course content - teaching aids - chalk and talk - brief a circuit - fly a circuit -critique on student flying - how to deflect questions when you don't know the answer- how to look wise and learned at all times .
I would go for cheapest possible , tick the box, get the certificate and get on with it.