Polish Hotel Group Orbis (essentially Accor franchise operator in Poland) is running some really great sale this weekend (check at www.orbis.pl) with their Ibis and Orbis Hotels going for 100 zl (Novotel/Mercure for 150), that is less than 20/30 GBP respectively. As these hotels are also bookable on expedia.co.uk you can get them essentially for free with the 20GBP initial discount. If you are lucky you may even get some extra airline miles from them. I`ve just stayed at two Orbis properties and liked both of them.Even if you will have to change your plans, you would still get 40GBP voucher for future use.