i have just moved home which has a Suprima 50! What sort of boiler is it? ?

From the site...
http://www.homeheatingguide.co.uk/efficiency-tables.php

Potterton Suprima 50 HE
Manufacturer Potterton
Fuel Type Gas
Boiler Type Conventional
Method Condensing
Flue Type Room-Sealed
Fan Fan Assisted
Output (kW) 14.76 - 14.76
Manufactured From/To 2004 - current
SAP seasonal efficiency 86.2%

There may be other Suprima 50 models though (other than the HE)

If there's a hot water tank in the airing cupboard then it's not a combi - a combi will light up when you turn a tap on for hot water - a conventional boiler will turn on when it needs to heat the water in the storage tank.

Potterton were taken over in 1996 or thereabouts and are now called baxi potterton. You can obtain a manual for your potterton boiler by calling their after sales technical support on 0870 6060780 ... they will give you a phone number and if you quote your boiler make, the paperwork appears in the post within 3-5 days.

Peccavi
July 2009