I have done nothing to my R apart from fixing a puncture and re-hanging the doors. Not washed it since new (nearly 5 months), not driven it (1 month as in my 2nd home in Greece). Coming back to London tonight. Back in Greece Sept, Oct, Nov, Dec. Back in London for X-mas and New Year. Then away March '16 onwards until June/July. Wonder why I have a car at all.
Get rid of it!
Or, take it to Greece and use it there!
Or, you could lend it to me for the next few weeks and help a damsel in distress.
I have no comment on your R predicaments (lack of use, tyres or otherwise), as I'm too busy lavishing my entire quota of pity on myself over the seemingly endless wait for my own R. So, unless you have soothing words of comfort, virtual warm hugs and kisses, you can bugger off