Day and a half later and things have been much much better.
Application fires up in ten seconds instead of four to five minutes, same for EPG. No 'No tuner availables' and just two picture freezes, interestingly on the same advert. These are easily sorted with a channel up/channel down. Scheduler has worked OK with correct result of one recording.
PC also seems to boot up quicker as I suppose the services/scheduler also had to load a 250meg database upon bootup.
Channel database is growing in size alarmingly, up to 30meg already. Shut the lot down and run EPG empty under advanced options appears to fix it.