Did they take DNA samples?
Download truecrypt www.truecrypt.org
It's free, it's has the backing of a person I know professionally (but you do your own research). Set it to encrypt the whole volume, the performance is enough that you will not notice it is encrypting and decrypting on the fly.
It's really up to MPs to protect their own and their constituents privacy. E.g. your cellphone is tracked, as is everyone else's, so when your constituent comes to visit that's logged in a database too (will be a big central database is Jacqui gets her way), as is your private visits and any other information of 'national interest'.
So for example, if your cell phone showed you visiting a clinic that specialized in stds a few times, a 'protector of the national interests' in blue might suspect you had an std, which he then might have a little dig to see whose cellphone you called and who you collocated with (whose phone was in the same location as yours often). Thus your secret may be 'reveal' in 'the national interest' to a newspaper by a politically motivated officer.
I wonder if they took DNA samples from that bed, or if it was just searched for hidden documents. That would be interesting wouldn't it, a politically motivated officer could reveal any DNA test results from the MP. If the DNA national database was there, they could locate who slept with who and leak that.
The ability of officers, empowered to grab any and all information, with unlimited access to mass databases of private information, and to treat 'the national interests' as 'the labour government interests' is quite terrifying.
The UK faces no great threat, no worse than any other western nation, yet look at what they've become.