thanks all :kissy:
Just for the record, as I said earlier on in the thread, I'd love it to be a Dresser design because then it might have paid the lecky bill, but honest guv, I'm not trying to make it into something it's not

not even in my head

It's just there is an unanswered question regarding a valid point I made about the age of the serial/design number on the base of this piece.
Nigel it seems we are agreeing are we not - quote
'It is quite possible for a company to produce a design for long, even extended periods of time - especially if it has been a good seller. This would make it possible for an item to have a serial, or design number on the base that dates from much earlier, but not a registration mark. i.e my base could have been designed many years earlier than 1934.
Whilst I agree the lid and the glass appear to be a correct match (and would therefore date to 1925 onwards using the glass as the date, and perhaps 1934 using the butter dish base with handles registered design to affirm this), the serial number on the base of my piece remains something to be investigated in terms of when it was designed. I am thinking that the glass and lid could have been designed and made to fit (as a deliberate design by H&H) into a base that was designed many years earlier.
The butter dish registered design date would answer that question, but I don't know what the parameters and latitudes are of a registered design. What I mean is, if the design for my base was registered years earlier, would the adaptation of it, by the addition of handles (for the butter dish), denote a new design, and therefore require it to be registered in it's own right as a new design, hence that butter base having a registered design number for 1934. If the answer to that is no, then I guess I have to admit defeat.
I will contact the registered designs office on Monday and see if I can trace the number somehow

JP thanks- until I have answered my question I think I have no intention of selling it. And even then perhaps not, because without the association of Dresser I suspect the value on these things is not high (or not high enough to pay for the amount of electricity we are consuming

)
thanks for all your help everyone, much appreciated.
m