Hi Robb
I just saw your post and thought I might be able to be of some help (nice to see a fellow Englishman on BiggerPockets!).
I've got some flats in west London (Ealing) which I self-manage (actually from where I live in Bergen in Norway). 4 websites which I found were very helpful for learning more about UK property investment are:
1. www.thepropertyhub.net (similar to Real Pockets but UK based and on a much smaller scale).
2. www.propertytribes.com
3. www.propertygeek.net
4. www.thepropertyvoice.net
Hope you find these useful - I'm sure that you will.
Please let me know if you would like any specific recommendations about resources to be found on these websites (podcasts, forums, articles, books etc.) or if I can be of any further help.
Interestingly, Southampton is one of the places that I've been considering for my next investment as the rental yields in London (and indeed large parts of South-East England) are now so low due to property prices being so high. Also, I remember being impressed with Southampton as a place to live when I worked there for a short period about 12 years ago. I understand that there has been quite a lot of development since then.
With kind regards,
Richard