Born to travel - last weeks in the UK

I've been planning for a while now to spend my last weeks in the UK travelling. Most of the Erasmus-pe0ple have already left Bangor or will do so within the next week.

While I planned to walk the Cambrian Way from Llandovery to Cardiff, the train connection between Bangor and Llandovery goes via Newport, which is virtually next to Cardiff - so I will probably walk from Cardiff to Llandovery and will visit some other places beforehand. My ex tempore journey plan is as follows:

Bath

Bristol

Cardiff

Cardiff - Machen

Machen - Pontypool

Pontypool - Abergavenny

Abergavenny - Capel-y-ffin

Capel-y-ffin - Crickhowell

Crickhowell - Storey Arms

Storey Arms - Llandovery

Aberystwyth

I have to be back in Bangor by the 19th(evening) or 20th(morning) so I can still wash and pack my clothes before leave for London, where my train goes. That leaves the 8th or the 9th as a possible start date for the trip.