thats the worry.... i'll have to leave at 7am to get there in time and I think that there is a bus service from Rugby. The missus wouldnt be impressed with 4 changes to get there!
Ah...I take it you are looking at a collection, and travelling by train.
Perhaps rather than using the train to Coventry, using Chiltern Railways and then a taxi from Warwick / Leamington....not going to cost you that much more than from Coventry station...
I have taked the bus from the north end of coventry - can't remember the service but I foud it via a google search. Its about £8 taki from the station and a lot less time/hassle.