Steve - I notice you are in Newark (I'm in Collingham - and I am the AO for Lincolnshire Area). For us, we're at www.lincstssc.co.uk but also at www.facebook.com/lincolnhsiretriumphs. We meet 1st Weds of the month at The Swan Holme on Doddington Road in Lincoln from 8pm. Events are posted on Facebook mostly but also tweeted via @LincsTriumphs. We're a very small but friendly group.
The other local meeting to you is the Notts Area. This is a really popular group and get a lot of cars and people attend (unlike us!). They meet at the Nags Head in Woodborough on the 2nd Monday of the month. Adrian and Nigel - the AOs - are very friendly and I can guarantee you'll be welcomed. http://www.tssc.org.uk/tssc/areas_final.asp?area_ID=17&area=Midland,%20Notts.
Local regular events which are worth attending are the Langrick Cafe Meetings near Boston, Horsepower at the Hall (Doddington Hall) and Last Thursday of the Month classic meet at Woodcocks, Burton Waters. All should be visible via the Lincolnshire Triumphs webpage and twitter. Boston and Stamford classic car shows, plus Thoresby Park are well attended.
Hope that helps!