BT 'phone contract renewals - would welcome any tips pls?

I'm just about to revisit my contract terms with BT. My needs are quite simple (I think) in that:

Have Sky via dish (inc Sports at discounted rate post their menu re-cut) + access BT Sports HD pack too

Have and use moby (not an i-phone) on 'cheap' terms for daytime calls - landline is rarely used during the day. Incoming callers appear to be on unlimited deals via various providers - and can dial a moby without penalty it seems. Most of my contacts/friends now seem to be calling from their moby's, borne of the airtime deals available.

Landline use is primarily for internet (via BT HH? - now aged but no driver to change) and can stand data limitation of say <20GB but would prefer to get 'unlimited' access for convenience.

Has anyone got any hints and tips, suggestions e.g. should I displace BT?    There are various ups and downs in all this vis the BT Sport element (price elevates if I don't use their broadband), how the landline charge works through etc. 

I located another thread which touched upon similar issues and, to my eyes, the conclusion in my case would be to retain the landline but seek to obtain best 'packaged' contract terms from whoever, which would be BT given the BT Sport aspects.

https://forums.naimaudio.com/to...o-ditch-the-landline

I've scanned the Vonage service and this looks to be aimed at the business market.