In reply to MightyMidget:
I took both that course and an earlier transition to outdoor rock course with PYB. I found the first course and the center to be very good and the instruction to a high standard.
At the time I the improver course I two was in a similar position in terms of experience and aspiration to you. I found I had two had issues with the delivery of content. For what was suposed to be an improver course we spent the first two days going over exactly the same ground as on the previous transition to outdoor rock course, without reguard to the stated entry requirements on the course. While i understand that an instructor needs to gauge the competency of participants i'm unable to understand why it took two days to work out that i was competant as a second. The other issue was the lack of any option for leading until the last two days of the course and then this was not possible due to the weather.
Please dont take tha above the wrong way I can wholey recomend PYB as a center and my first course with them was terific. I think they simply need to review the sylibus is for this improver course and who it is aimed at then state that more clearly up front.
As to value for money go and do the maths for the alternative yourself, work out who much 5 days full board accomadation, kit hire and transport would cost you will see that you are getting the guiding / instruction at a very good rate.
As an alternative for the level you have reached i would either recomend another course with PyB or consider Glenmore Lodge PyB's equivilant in Scotland. They do a 5 day learn to lead course, and based on the recent 5 day guided climbing trip to skye i have done with them i can say their instructors are phenominal. With an ability to guague exactly how far to push for me to get the most from the trip without it being too much to handle as to make it inappropriate for my ability.
Hope that helps