well, things have progressed on for me...
The story so far... For all those looking for ideas on timescales and wait lengths .....
Wed 1st May 13 - applied (for close 3rd) - as internal candidate.
Wed 19th June 13 - received practice materials
Thurs 11th July 13 - got a heads up from my current manager that resourcing had emailed requesting my release for stage 1 day on Mon 15th July !
Fri 12th July 13 - rang resourcing as hadn't received any letter/email, duly got email 2 hours later.
Mon 15th July 13 - sat stage 1 (GB + TRP1&2) at Penta Hotel Reading.
Wed 4th Sept 13 - manager rang me to say resourcing had requested my release on Mon 9th for stage 2, was it ok as it was my rest day ?! "Heck yes !"
Fri 6th Sept 13 - rang resourcing first thing as had not received invite or details - emailed within minutes
Sunday 8th Sept 13 - traveled to Newport hotel, crammed on the bopit and slept !
Monday 9th Sept 13 - attended stage 2 (Reactions/Co-ordination and CBI) at Newport Assessment Centre - passed reactions, advised should hear within 1 week re CBI result.
Tues 17th Sept 13 - rang resourcing to request my online status be updated from "invited to assessment on 15th July" - advised would be updated (never were until the end) and to ask if any result from CBI - nope.
Thurs 26th Sept - heads up from my manager that she had received an email asking for her to release my the next Wed 2nd Oct for DM interview
Mon 30th Sept - rang resourcing who said they'd not had notification I was to have a DM interview !
My manager replied to her email and got the reply that I should get an email invite on Tuesday.
Tuesday 1st Oct 1505hrs I got an email invite from resourcing for a DM interview to be held just 22hrs and 55mins later!
Wednesday 2nd October - had my DM interview in Reading's Penta Hotel.
and

having been told we may have to wait until Monday I was surprised that on Thursday 3rd October in the afternoon, I got a phone call to make me a conditional offer of a training place (conditional on passing medical) !
So, I'm through, just the medical to go and I don't foresee any problem there.
Very relieved and happy chappy, although my boss faces challenges staffing her ticket office, there are a few of us going through applications to move on !
Ian