Where can i go online to get a package deal with hotel to Barcelona by train?

Me and my bf want to go to Barcelona from London for a week by train not plane. We thought it might be cheaper for a package deal (train and hotel) but can't find any website that does it. Alternatively does anyone know a source for cheap but niceish hotel?

http://www.seat61.com/Spain.htm
best bet is to use eurostar.

Take Eurostar from London to Paris (2 hours 20 minutes)
,once in Paris take the Elipsos trainhotel from Paris to Barcelona overnight. (bedrooms, a restaurant and a café-bar, The Gran Clase bedrooms have a private toilet and shower)

Fares start at £59 return for Eurostar from London to Paris plus £59.50 each way for the trainhotel from Paris to Barcelona including a bed in a 4-berth sleeper for the night. £132 each way per person in a 2-bed Gran Clase sleeper (dinner with wine and breakfast included)

You can check out this link for hotels deals: http://www.eurostar.com/UK/uk/leisure/latest_deals.jsp

The train-Hotel packages is a new option for agencies in Spain, Iberojet and renfe just created that option but you have to consult with an agency for this option, any Agency will have information about it and can book it for you, you can't do it by your self, their websites asks for an The agency Identification number when I tried to access the information, you check it out here http://www.iberojet.es/ (it's in the bottom left)

I hope that would help