Just to add to the options for multiple TVs:
I used to use a PAL modulator, as described here using,. the RCA connections and this continues to work well for one a very old TV that does not support HD. It will play HD recordings but obviously with degradation on resolution
I have however recently upgraded my main Vs and have now added a FreeView modulator to modulate the HDMI signal onto a local Freeview channel 800. This eventually worked very well but the first Modulator, an Edison, introduced so much encoding delay that the Humax remote control (routed back over my distribution amplifier) was useless. When skipping through a program the delay was so long that Humax took away the playbar before I could see it on the remote TV!
I returned the Edison (thank you amazon) and bought a Technomate modulator. There is still a noticeable lag but it is much less that the Edison and works perfectly. This has now been working well for four months. The picture and sound quality are good on HD recording ans well as SD recordings. The HDMI port on the model I bought has a "pass through" function which has no noticeable effect on the TV display.
It is obviously a more expensive solution that a simple modulator but you do get HD quality on the remote TVs