I am also now thinking that maybe the PM himself should be tweeted about this.
A few points to consider in this approach,
1, He is a Conservative.
2,He is the 'Leader' of this fine country.
3, he likes to stick the knife in at red Ed and labour in general.
If he doesn't acknowledge this then he may well not have the public interest at heart and have a more 'favourable' stance with pharma and tobacco companies.
Might also be good to get the press in on this, they do love ripping politicians apart.
Whilst i do have a twitter account, i have not a clue on using it, going to have to get my kids to show me lol!